[TC-1372] selectedColor for android button

[jira ticket](http://jira.appcelerator.org/browse/TC-1372)

I should mention that i had to use a trick because the button highlighted state is note set directly on touch down. So i had to use a timer and try and find the exact time :s Couldn t find anything on the web about that timing difference.

There also a little delay on touch up (about 60ms i think) but as it is not spottable, i did not delay anything.