Updating oauth2_provider to 1.0.2b

Adding release 1.0.2b from https://github.com/sachinsudheendra/gocd_oauth2_provider_engine/releases/tag/release_1_0_2b
Merge remote-tracking branch 'upstream/master' into oauth2_provider_upgrade_102b
Removing the zip-release used and used tar instead. File permissions should be restored to the old values
Updating Gemfile.lock after running bundler
Merge pull request #475 from sachinsudheendra/oauth2_provider_upgrade_102b

Oauth2 provider upgrade to 1.0.2b