APIs worked started

Using Moodle REST APIs
Testing with MoodleRest.jar

Not much success by far.
MoodleRest Options file added

Contains all strings and function used in REST calls
MoodleToken class added - incomplete

Gets tokens from 3 different service one after other only if the former
fails. Parser missing.
Added AppHttpClient from prev MDroid

May not use this.
MoodleRest for Courses started
MoodleRest for CourseContents started
MoodleRest for Discussions started