Update LinkedIn Provider

Added missing userUid(), userEmail(), and userScreenName() methods.
Merge pull request #25 from crhayes/master

Update LinkedIn Provider
Create .travis.yml
Added getScopes and setScopes methods to IdentityProvider.

Signed-off-by: Isern Palaus <ipalaus@ipalaus.com>
Merge pull request #28 from ipalaus/feature/scopes

Added getScopes and setScopes methods to IdentityProvider.
Rename Linkedin.php to LinkedIn.php

Fixed an issue where LinkedIn provider wasn't found in case-sensitive environments.
Merge pull request #31 from crhayes/master

Rename Linkedin.php to LinkedIn.php
Vkontakte Provider has been added
Merge pull request #37 from PavelPolyakov/master

Vkontakte Provider has been added
Create LICENSE
Added widgets
Listed MIT in README
PSR-2 CS Fixes
Add a Bitdeli badge to README
instagram missing methods
Merge pull request #44 from bitdeli-chef/master

Add a Bitdeli Badge to README
Set approval prompt to auto from force
Merge pull request #47 from robertpitt/master

Set approval prompt to auto from force
Changed IdentityProvider to enforce & as query param separator and ignore ini setting
Merge pull request #50 from sdh100shaun/master

http_build_query params change as per issue#48