updated cert bundle to use the current curl bundle
fix broken tests and remove some broken ones
bump version to 3.2.1
Use `empty()` for signed request value check
Avoid trying to reuse spent authorization codes

Conflicts:
	readme.md
	src/base_facebook.php
clarified apache specific lookup for ssl & added ability to look for nginx values for ssl
Merge pull request #45 from favrik/master

Use `empty()` for signed request value check
Merge pull request #50 from evanadelman/master

SSL detection breaks in NGINX
Fixed a vulnerability with signed requests
Merge pull request #57 from kilotaras/vulnerability_bug

Fixed a vulnerability with signed requests
Added the extra param: appsecret_proof to the oauth api calls
Merge pull request #69 from anankan/master

Added the proof of appsecret param to API calls