allow to extend OAuthEntryPoint
Merge pull request #351 from evgeniy-baba/hotfixes/allow_extend_oauthentrypoint

allow to extend OAuthEntryPoint
Prepare release 0.2.7
Update DropboxResourceOwner.php to use oAuth2
Dropbox oauth2 test
Merge pull request #357 from adwww/master

Update Dropbox to oAuth2
Merge remote-tracking branch '0.2'
Add missing note about Dropbox changes
LinkedIn now uses OAuth2 approach