Merge pull request #10 from IvanMartinez/master

Added issue_code_grant/3 and issue_code_grant/4
Issue #13 verify_redirection_uri improvements
Tests updated. Minor fixes.
Enable Travis CI and bump vsn to 0.1.0
Linebreak-mishapp
Merge branch 'issue_13_verify_redirection_uri' of git://github.com/IvanMartinez/oauth2 into IvanMartinez-issue_13_verify_redirection_uri
Change oauth2_backend to a behavior
Merge branch 'IvanMartinez-issue_13_verify_redirection_uri'

Conflicts:
	src/oauth2.erl
	src/oauth2_backend.erl
Split test-backend to it's own module
Merge branch 'master' of git://github.com/kivra/oauth2 into kivra-master

Conflicts:
	src/oauth2.erl
	src/oauth2_backend.erl
	test/oauth2_tests.erl
Separated scope verification in oauth2_backend:verify_client_scope/2 and
oauth2:verify_user_scope/2 (Issue #12)