Add link to presentatio in README.md
add file class relavant to CXFile
add other source location apis
add more SourceRange apis
Merge pull request #13 from sabottenda/file_and_locations

add File and Locations API
add types
add create_translation_unit and Index related tests
add more translation unit apis
fix tests for travis
add more apis for Cursor
Merge pull request #14 from sabottenda/add_rest_apis

Add rest apis around TU and Cursor and so on
fix test error caused by GC timing problem
Merge pull request #15 from sabottenda/fix_travis_test

fix test error caused by GC timing problem
remove double defined method
add diagnostic apis
Merge pull request #16 from sabottenda/diagnostic

Add Diagnostic methods
Added support for inline command comments
Replaced cursor_first_expr which represents the first expresion member of the enum, with its actual value, and the first expression - cursor_unexposed_expr.
expose comment source range
add direction parsing to ParamComment