LinkedIn Integration

LinkedIn Integration
LinkedIn
Refactor and reorganize linkedin provider.
Rename LinkedIn provider.
Pass error out to caller.
Add LinkedIn to readme.
Fix permissions error

error in the parameter name of the permissions for the web login with facebook
Merge pull request #31 from jerson/patch-1

Fix facebook-web permissions error.
Fixed typo in Podspec
Merge pull request #35 from paulyoung/typo

Fixed typo in Podspec.
Added LinkedInWeb to the potspec
Fix default constructor loop bug. Fixes #39.
Merge pull request #38 from alexito4/master

Add LinkedIn to Podspec.
Call the completion block in tumblr provider.
fixes Foursquare versioning bug
Add the ACFacebookAudienceKey in the native facebook provider
Merge pull request #41 from alexito4/master

Support Facebook audience for system provider.
Merge pull request #40 from Yosee/foursquare-provider

Fixes Foursquare API version bug.
added SimpleAuthSingleSignOnProvider
Merge branch 'sso' of https://github.com/Yosee/SimpleAuth into sso