Remove ActionBarSherlock and Maps dependency from library

As discussed in #205 here is a pull request which removes the ActionBarSherlock and Maps dependency from the SlidingMenu library.

ABS was no longer referenced from the library so I just removed it. Users that merely accidently depended on ABS because they used SlidingMenu will have to explicitly depend on ABS if they intend to use it.

There is only one reference to Maps, in SlidingMapActivity, so I moved it to a separate jar project. Users that need the SlidingMapActivity would need to depend on the slidingmenu-maps-support artifact as well as the library itself to get SlidingMapActivity on their classpath.

Speaking of classpath I have not changed any .classpath files because I do not use or know Eclipse that well.

I had a go at setting up a pom.xml for the example app as well but it turns out that it does not build with the newest SlidingMenu library because BaseActivity expects SlidingFragmentActivity to inherit SherlockFragmentActivity.