Fixes to build with CMake

[rexkerr]

• Updated CMakeLists.txt files to match the current repository layout and current Jamfiles.
• Updated unit tests to (consistently) not specify link configuration in the source, but to let the build configuration specify the variables.
• Updated unit tests to properly import the main entry point for the tests.

[rexkerr]

FYI, not all tests are passing, but I didn't change any source, so I don't think I made anything worse:

Test project /Users/rexkerr/Development/boostache_build
Start 1: adapt_test
1/8 Test # 1: adapt_test ....................... Passed 0.01 sec
Start 2: grammar_basic
2/8 Test # 2: grammar_basic .................... Passed 0.01 sec
Start 3: render_traits
3/8 Test # 3: render_traits .................... Passed 0.00 sec
Start 4: traits
4/8 Test # 4: traits ........................... Passed 0.00 sec
Start 5: mustache_compiler
5/8 Test # 5: mustache_compiler ................_Failed 0.00 sec
Start 6: mustache_end2end
6/8 Test # 6: mustache_end2end ................._Failed 0.00 sec
Start 7: mustache_parser
7/8 Test # 7: mustache_parser ..................***Failed 0.00 sec
Start 8: foreach
8/8 Test # 8: foreach .......................... Passed 0.00 sec

63% tests passed, 3 tests failed out of 8

[mjcaisse]

Thanks Rex. Unfortunately, master was far out-of-date. I've taken care of getting master and develop back in sync. Please also make PR's against develop.