The editAssignment API now can take an Assignment.

The new overload takes an edited assignment then pull the data from the assignment to send to
the server.

The old method has been marked as Depercated.

Also added new members to the Assignment modle

the getGradingType(Context context) has been marked as Deperacated and been
replaced with getGradingType().

Added a getGradingTypeFromAPIString(String gradingType) method.
The editAssignment API now can take an Assignment.

The new overload takes an edited assignment then pull the data from the assignment to send to
the server.

The old method has been marked as Depercated.

Also added new members to the Assignment modle

the getGradingType(Context context) has been marked as Deperacated and been
replaced with getGradingType().

Added a getGradingTypeFromAPIString(String gradingType) method.
Added setDueDate(Date dueDate).
Added setSubmissionType(SUBMISSION_TYPE submissionType)
Added setGradingType(GRADING_TYPE gradingType)
Added new setters to Assignment modle
Merge branch 'editAssignmentAPI-rf-update' of https://github.com/nbutton23/CanvasAPI into editAssignmentAPI-rf-update

Conflicts:
	src/main/java/com/instructure/canvasapi/api/AssignmentAPI.java
Merge pull request #15 from nbutton23/editAssignmentAPI-rf-update

The editAssignment API can now take an assignment
Update build.gradle

changed version number
Added onCallbackReadFromCache to statusDelegate.

NOTE: This is a non backwards compatible change.
Forget about the last commit. . . Now you have a source!
Merge pull request #16 from nbutton23/onCallbackReadFromCache

onCallbackFinished Changes
Updated the date helpers for consistency purposes.
Fixed a small date error when adding the new DateHelpers.
Merge pull request #17 from matthewrice345/dateHelpers

 Rewrite for our DateHelpers.java which makes all our display dates standard to the users medium date preferences. i.e. dates should now all look like Mar 30, 2090
Changes to SectionAPI. Added setters to the model class and
fixed an API call to get all the Sections.
Merge pull request #18 from bradylarson/master

Changes to SectionAPI. Added setters to the model class and