add ability to set extra params to oauth2 url endpoints

Co-authored-by: Benjamin Sellers <bsellers@gmail.com>
Update provider to be aligned with pull request #319 from envisia/master  

We have option to disable registration, but in provider we have a link to nowhere.
Merge pull request #338 from hugogoncalves/patch-1

Update provider to be aligned with pull request #319 from envisia/master
Disabled Registration variable name  
Change to positive version securesocial.registrationEnabled
- Hide sign up link when Registration provider is disabled (thanks @hugogoncalves)
- Fixed: ProviderController.toUrl was not using the session returned by the event handler.
- Added onPasswordChangeGoTo option (thanks @fernandoacorreia)
- Disabled Registration feature (thanks @c-schmitt)
- Fixed: PasswordResetEvent does not have updated password
- Fixed typos in readme and docs (thanks @fayimora, @fernandoacorreia, @nelsonblaha)
- Minor doc updates (thanks @dnephin)
- Added traditional Chinese message file (thanks @yuchuan1)
- Fixed password change with multiple hashers (thanks @FabienPennequin)
- Fixed compiler warnings
- Improved SecureSocial.currentUser to avoid the UserService.find call if the request has the user already.
- Added expiration to Cache.set calls
Merge pull request #340 from hugogoncalves/master

Disabled Registration variable name issue #339
updated change log
- updated changelog and copyright notices
Add russian locale
- Updated docs for maven and fixed a rendering problem in the password change page.
- Starting 2.1.3 the module is published to Maven Central
Merge pull request #172 from chazmcgarvey/extra-url-params-2

add ability to set extra params to oauth2 url endpoints
- Add ability to set extra params to oauth2 url endpoints (thanks @chazmcgarvey and @nascosto)
Merge pull request #344 from siman/master

Add Russian locale
- Removed duplicate entry in Russian locale
- Added Russian locale (thanks @siman)
Fixed i18n issues: API breaking changes in TemplatesPlugin, PasswordValidator and templates (they need an implicit Lang as parameter now).