Implemented JWT bearer authorization grant.
Implemented ClientAssertionTypeInterface as per bshaffer's suggestion and updated GrantController to suit.
Updated storage drivers to support JWT bearer authorization grant.
Created tests for JWT bearer authorization grant.
Created JWT library for decoding, encoding and verifying JWTs.
Merge branch 'master' of git://github.com/F21/oauth2-server-php into F21-master
Added doc block for JWT generator in the JWT test to explain the parameters.
Updated formatting to compile with psr-2.
Converted OAuth2_Util_JWT to non static and updated JWTBearer grant type and its tests.
Fixed formatting.
Merge branch 'master' of git://github.com/F21/oauth2-server-php into F21-master
Fixed formatting to psr-2 standards.
Merge branch 'master' of git://github.com/F21/oauth2-server-php into F21-master
merges PR, resolves conflicts, and resolves some formatting issues