Update base_facebook.php

Added the extra param: appsecret_proof to the oauth api calls

https://github.com/facebook/facebook-php-sdk/commit/0b0d711498fb4a283ce84802c34e49a491134a1f#src/base_facebook.php
Added .idea folders and changed from RST to Markdown read me and changes files.
Merge branch 'full-install'

# By Alfonso Martinez (1) and Maxime Rassi (1)
* full-install:
  Added .idea folders and changed from RST to Markdown read me and changes files.
  Update base_facebook.php