Added ViewClient.findViewsContainingPoint() and related methods

- Added tests
Merge branch 'master' into find-views-containing-point
Added View.isClickable() support

- Added filter in ViewClient.findViewsContainingPoint()
- Added tests for API 15 and API 17
culebra: Added --interactive command line opition
Merge branch 'master' into find-views-containing-point
Added Excerpt2Code and excerpt()

- Reformat
- culebra: Added interactive support
Merge branch 'master' into find-views-containing-point