Validate email regex used in the Filter class improved

Related to: https://groups.google.com/forum/?hl=en#!topic/sifophp/5o0tkI2nC44
Merge pull request #29 from JavierCane/devel

Validate email regex used in the Filter class improved
SphinxQL improvements
* Prepared statements
* Some debug changes
Corrected documentation in Debug
Add SphinxQL queries errors in debug summary.
SphinxQL options
* Added setOptions to append OPTION clause to queries
* Improved backtrace in debug
- Bugfix: add return after setting redirection headers. Previously it was dispatching error controller, sending empty error template contents with redirect.
- Small refactor on Benchmark getInstance.
SphinxQL call snippets fix
Merge branch 'master' into devel

* master:
  Changed Facebook submodule location
  Delete unexisting repo Facebook