Implemented slot number for custom variables.
Slot numbers were't sent before, they were just concatenated which
means that the first custom variable's slot number were sent as 1.
Contributor : Deniz Gurkaynak

Adding options to enable or disable SSL
Two new public methods have been added.
- enableSSL, which will set a flag to use GA's HTTPS URL upon the
beacon requests.
- disableSSL, which will set a flag to use GA's HTTP URL upon the
beacon requests.
By default, the HTTP URL is used.

contributor : ethul
reindented and cleaned up unused vars
Merge branch 'contribs'
1.1 : merged pull requests from ethul and dgurkaynak

tested with success
Merge branch 'contribs'