MOBILE-487 Changes after testing in several Android devices

After testing in old and new Android devices, we have noticed that this
hack is still necessary in modern devices (4 and above) in older
devices this hacks create performance and usability issues
I don’t like very much specific code for Android, but it continuos
changes in the WebView component and browser brokes the app usually
Merge pull request #34 from moodlehq/MOBILE-487

MOBILE-487 Changes after testing in several Android devices