Merge pull request #24 from shalskar/bugfix/oom-exception

- Move longHoldTimer to be a field of PeekAndPop

- Fix bug where when touch was released in between the timer triggeri…

…ng and the runnable starting , peek view wouldn't pop and would remain on the screen.

- Added onEnter() method to OnLongHoldListener

Merge branch 'master' of https://github.com/shalskar/PeekAndPop

Merge branch 'master' of https://github.com/shalskar/PeekAndPop