Added EE < 2.6 compatibility

Hey Bransin,

I added a check for the ee() function as a fallback for versions of EE prior to 2.6.0.

See discussion here: http://devot-ee.com/add-ons/support/google-maps/viewthread/9870#33947

This is also how Low does it in his add-ons. Seems solid. Check it out and merge if you're cool with it.