update readme
CLOSED - task 378: Apply ViewHolder pattern in ArrayAdapters
https://github.com/DigitalCampus/oppia-mobile-android/issues/issue/378
don't override vimeo plugin links
CLOSED - task 388: Make phone no required on registration
https://github.com/DigitalCampus/oppia-mobile-android/issues/issue/388
try to fix vimeo player embeds in webviews
merge from pull
CLOSED - task 390: Issue with list view adapter on download courses
highlighting incorrect tags/categories
https://github.com/DigitalCampus/oppia-mobile-android/issues/issue/390
New version no
Merge remote-tracking branch 'upstream'

Conflicts:
	AndroidManifest.xml
	src/org/digitalcampus/oppia/adapter/QuizFeedbackAdapter.java