Packaging, error messages and bug fixes

• Handle wrongly encoded messages in log [fix #20]
• Make teiid Python 3 compatible [fix #13]
• Better solving the do_command() bug
• Bringing back eval() - workaround for XMLRPC
• Output nicer tracebacks on connection failures
• Enable automated python dependecies generator
• Last spec file changes for RHEL7 (hopefully)
• For older releases build both python2 and python3