Added a millitime() function. This returns number of milliseconds since the Unix Epoch.

This was added because timestamps needed for SSO tokens need to be in milliseconds.
Added public function that will generate the appropriate token for sso. This utilizes added private function which does the encryption.
Added the ability to specify which particular account you will be using the new netsuite connection with. This will allow the __construct to find the appropriate host based on the account. Specifying the wsdl is not sufficient because the location header also needs to the appropriate host and if you specify that in the options if is just overwritten.
Merge pull request #6 from rgmccaw/add_utility_functions_and_ability_to_dynamically_set_host

Add utility functions and ability to dynamically set host