Implemented full text search functions modes
Added new test cases for new search functions
Documented new changes for search functions
Separated FullTextModes into a separate module
Changed init mode to DEFAULT instead of None
Changed documentation and added new test cases
Modify for Travis
Update test case
Update travis
change test user into travis
update test
Merge remote-tracking branch 'alejom99/master' into dev

Conflicts:
	sqlalchemy_fulltext/__init__.py
	test_sqlalchemy_fulltext.py
fix ut wrong count