feat(yaml.lua): Add support comments

feat(yaml.lua): Add support check YAML version tag
feat(yaml.lua): dump to yaml (author @snowyu, PR exosite#12)
fix(yaml.lua): negative numbers as properties should not parse as a list (author @FreeMasen, PR exosite#11)
fix(yaml.lua): timestamp timezone
fix(yaml.lua): only parsing first block hash with indent==0
fix(yaml.lua): parsing block after empty row
feat(samples): Check comments
fix(samples): timezone
feat(samples): Check negative numbers as properties

Author: PavelK

samples/array-member.lua

@@ -0,0 +1,23 @@
+return {
+  ["arr"] = {
+    [1] = {
+      ["prop1"] = {
+        ["subprop1"] = "test",
+        ["subprop2"] = {
+          ["test2"] = "test",
+          ["test3"] = {}
+        }
+      }
+    },
+    [2] = {  
+      ["prop2"] = {
+        ["subprop3"] = "test.test"
+      }
+    },
+    [3] = {  
+      ["prop3"] = {
+        ["subprop4"] = 5
+      }
+    }   
+  }
+}

samples/array-member.yaml

@@ -0,0 +1,11 @@
+---
+arr:
+  - prop1:
+    subprop1: test
+    subprop2:
+      test2: test
+      test3: {}
+  - prop2:
+    subprop3: test.test
+  - prop3:
+    subprop4: 5

samples/comments.lua

@@ -0,0 +1,12 @@
+return {
+  ["key"] = {"value line 1", "value line 2", "value line 3"},
+  ["key2"] = 30,
+  ["key3"] = "String value",
+  ["key4"] = "#not a comment",
+  ["key5"] = false,
+  ["key6"] = 123,
+  ["key7"] = {
+    ["key8"] = "value",
+    ["key9"] = "not#comments"
+  }
+}

samples/comments.yaml

@@ -0,0 +1,17 @@
+---
+key: #comment after id
+   - value line 1
+   #comment before list item
+   - value line 2
+#comment
+ #multi
+        #line
+   - value line 3 #Comment after list item
+key2: 30 # comment 5
+key3: "String value" # comment after string with quotes
+key4: "#not a comment"
+key5: false # Comment boolean
+key6: 123 # Comment number
+key7:
+  key8: value # Comment simple string
+  key9: not#comments #Comment simple string with # inside and multiple # 

samples/dates.lua

@@ -1,8 +1,8 @@
 return {
-  ["date0"] = 1305907200,
-  ["date1"] = 1305907200,
-  ["date2"] = 1293897600,
-  ["date3"] = 1298282160,
-  ["date4"] = 1303335300,
-  ["date5"] = 1307018730
+  ["date0"] = os.time{year=2011, month=5, day=21, hour=0, min=0, sec=0, isdst=false},
+  ["date1"] = os.time{year=2011, month=5, day=21, hour=0, min=0, sec=0, isdst=false},
+  ["date2"] = os.time{year=2011, month=1, day=2, hour=0, min=0, sec=0, isdst=false},
+  ["date3"] = os.time{year=2011, month=2, day=21, hour=17, min=56, sec=0, isdst=false},
+  ["date4"] = os.time{year=2011, month=4, day=21, hour=5, min=35, sec=0, isdst=false},
+  ["date5"] = os.time{year=2011, month=6, day=2, hour=20, min=45, sec=30, isdst=false}
 }

samples/hash.yaml

@@ -1,20 +1,29 @@
 ---
-  users:
-    tj:
-      name: tj
-      age: 23
-      email: 'tj@vision-media.ca'
-    bob:
-      name: 'bob'
-      age: 27
-    ted: { name: ted, age: 32, email: ted@tedtalks.com }
-  country:
-    name: Österreich
-    website: http://en.wikipedia.org/wiki/Austria
-  space:
-    description: space, the final frontier
-  brackets:
-    square: Square [brackets] can go in the middle of strings
-    squiggle: Squiggle {brackets} can also go in the middle of strings!
-    extrasquare: [Scratch that] brackets can go at the beginning as long as they close and have text after.
-    extrasquiggle: {Scratch that} squigs can go at the beginning also!
+users:
+  tj:
+    name: tj
+    age: 23
+    email: 'tj@vision-media.ca'
+  bob:
+    name: 'bob'
+    age: 27
+  ted: { name: ted, age: 32, email: ted@tedtalks.com }
+
+
+
+country:
+  name: Österreich
+  website: http://en.wikipedia.org/wiki/Austria
+
+space:
+  description: space, the final frontier
+
+brackets:
+  square: Square [brackets] can go in the middle of strings
+
+
+  squiggle: Squiggle {brackets} can also go in the middle of strings!
+
+  extrasquare: [Scratch that] brackets can go at the beginning as long as they close and have text after.
+  
+  extrasquiggle: {Scratch that} squigs can go at the beginning also!

samples/invoice.lua

@@ -10,7 +10,7 @@ Suite #292",
     ["family"] = "Dumars",
     ["given"] = "Chris"
   },
-  ["date"] = 980179200,
+  ["date"] = os.time{year=2001, month=1, day=23, hour=0, min=0, sec=0, isdst=false},
   ["invoice"] = 34843,
   ["ship-to"] = {
     ["address"] = {

samples/log.lua

@@ -1,5 +1,5 @@
 return {
-  ["Time"] = 1006498902,
+  ["Time"] = os.time{year=2001, month=11, day=23, hour=10, min=1, sec=42, isdst=false} ,
   ["User"] = "ed",
   ["Warning"] = "This is an error message\
 for the log file"

samples/log2.lua

@@ -1,5 +1,5 @@
 return {
-  ["Time"] = 1006498951,
+  ["Time"] = os.time{year=2001, month=11, day=23, hour=10, min=2, sec=31, isdst=false},
   ["User"] = "ed",
   ["Warning"] = "A slightly different error\
 message."

samples/log3.lua

@@ -1,5 +1,5 @@
 return {
-  ["Date"] = 1006498997,
+  ["Date"] = os.time{year=2001, month=11, day=23, hour=10, min=3, sec=17, isdst=false},
   ["Fatal"] = "Unknown variable \"bar\"",
   ["Stack"] = {
     [1] = {