cleaned up erroneously imported bin, added clear button, added support Fragments

Hi

these patches add support for allowing a clear button. While I find the option with swiping the text label on the initial activity nifty, I think having a clear button is advantageous and sometimes easier to figure out.

Also the initial version could not be used if your application used the support library for Fragment support (havent tested if the rest of the code actually works on 2.3 but at least now it compiles).