Fixes #21.

Added strange "COMPLIANCE" scope.

Add support of uploading media

Returns "Not enough permissions to access media resource".
I hope LinkedIn will resolve it eventually.

Include poster's name to company page comment

Add comments to company share

Merge pull request zoonman#11 from iamsalnikov/set-access-token-test

Tests for \LinkedIn\Client::setAccessToken() method

Instantiate token dynamically

Improve error handling

Doc update

Update composer.json