Small bug fixes. Fixes #13
Version bump
Merge branch 'refs/heads/develop'

Conflicts:
	composer.json
	src/OAuth2/AuthServer.php
	src/OAuth2/Grant/Password.php
Fixed repo url
Throw an exception if a grant can't be loaded when called in getGrantType
Allow grant access token expiresIn override
Updated tests for custom expires in
New test for getGrantType to test for exception
Renamed setExpiresIn method to accessTokenTTL
Added method to set the auth token TTL
Added refresh token TTL
Renamed get/setExpiresIn to get/setAccessTokenTTL
Added refresh token expires column
Updated associateRefreshToken to use expire time
Test for setAuthTokenTTL
Test for setRefreshTokenTTL
Updated the README
Updated the changelog