[bug973119] - Moved Google Analytics snippet into separate file

[bug973119] - Forced 'https' and changed 'if' statement to pure javascript

[bug973119] - Added 'async' to script and removed ' from '_gaq.push'

[bug973119] - wrapped code in 'function' in order to get rid of global variables
Bug 971839 - Implement new log-in system on webmaker.org