Update Clean.apk

The lib/ folder contains native libs so it must never be deleted.

https://github.com/appium/clean_apk/commit/af006af44b0c85006a8fa47c5fa3ab2cd6f40739

adb logcat -s "clean.apk" will display the debug log of clean.apk. This makes it
easy to find out if it's running successfully and what files are removed.

https://github.com/appium/clean_apk/commit/0445f7d0d1286c569c06e10d86bdcc1ad950688a
Merge pull request #1251 from bootstraponline/master

Update Clean.apk
Don't accept the alert when we're trying to dismiss it

If cancelButton().isNil() that doesn't mean there isn't a cancel button.
The cancel button is always button[0]. Press the dismiss button when requested
instead of calling acceptAlert().

Fix #1253
Merge pull request #1254 from bootstraponline/accept_alert

Don't accept the alert when we're trying to dismiss it
Update gestures.md
Merge pull request #1257 from ritika-mish/patch-1

Update gestures.md
Refactored setOrientation() for Android.

Appium throws "Set the orientation, but app refused to rotate." when
setting the orientation to landscape on Android, which was fixed by
calling the correct function. Also, made the code simpler by defining
portrait=(0 degree rotation) and landscape=(270 degree rotation)
regardless of current display rotation. Moreover, unfreeze device
rotation at the end.
Merge pull request #1260 from paymand/orientation_refactor

Refactored setOrientation() for Android.
Checking in graphics resource
Merge pull request #1263 from penguinho/master

Checking in graphics resource