Avoid jQuery/$ incompatibilities with scripts injected by third
parties. This change is compatible with existing code, except if jQuery
was loaded after the call to the main Gmail() function.
Simplified initialization of the local $ variable. In the absence of
a localJQuery argument, Gmail() will use the value of the global jQuery
variable at the time it is called rather than when it is defined. This
is good enough for legacy code.
Merge pull request #68 from esperco/mj/jquery-rescue

Avoid jQuery/$ incompatibilities with scripts injected by third parties