Integrate 1920 Source Format and Refactor Grader

[geshuming]

This is a re-pull request since the other branch was badly done.

Changes:

• Changed from Output[] to Summary output format
• Refactored for new XML format

Todo:

• Rewrite tests to only test autograder and not library files

[coveralls]

Pull Request Test Coverage Report for Build 211

• 39 of 39 (100.0%) changed or added relevant lines in 5 files are covered.
• 12 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.1%) to 35.073%

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Files with Coverage Reduction	New Missed Lines	%
src/graphics/curves_library.js	12	70.22%

Totals
Change from base Build 156:	-0.1%
Covered Lines:	1044
Relevant Lines:	2918

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💛 - Coveralls

[yyc]

Just a few minor issues in the comments, fix those and it should be good to go.

[yyc]

lgtm