Merge pull request #1 from instructure/master

Update 10-23-14
Changed an AssignmentGroup's group_weight to use a double instead of a long.

group_weights can use decimal places and will error out on retrofit for courses with group_weights
using decimal precision.
Merge pull request #84 from hhoang/master

Changed an AssignmentGroup's group_weight to use a double instead of a long
Merge pull request #85 from matthewrice345/master

Updated the build tools version to 21.1.0
Added support for gpa_scale grading type
Added support for gpa_scale grading type in canvasapi
Merge pull request #2 from instructure/master

Upate
Add RxJava
Merge pull request #86 from hhoang/master

Added support for gpa_scale grading type
Merge pull request #87 from joshuadutton/master

Add RxJava
Updated gradle files to next version of gradle.