Completed primary lexer features and unittests.
Deleted accidentally committed gtest configure.
Refactored Lexer to require LexerSource object at init. Fixed mem leak.
Exceptions parent class.
Exceptions classes for common lexer errors.
Lexer Character constant support.
Lexer string type, exception message line numbers were switched, and functional test.
Merge pull request #2 from gundermanc/features/lexer

Primary lexer features and unittests.