Edx-sga

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- Cleaned up zip file creation and retrieval code
- Update README.md
- Update README.md
- Handle static_asset_path setting (223)
- Added logic to clear a user&39;s state in the XBlock
- Replace static links when rendering solution text (217)
- Updated readme (updated installation/usage details, changed format to .md)
- Fixed file modified time calculation for submission zip file
- Enable zip file creation using S3 or local file storage
- Serialize and parse solution as an XML element, if valid XML (211)
- Move ShowAnswerXBlockMixin into SGA (208)
- Add support for graceperiod (207)
- Use UTC for timestamp (206)
- Upload coverage to codecov (201)
- Fix tests (203)
- Clean tests (200)
- Reordered XBlock class methods
- Integrate ShowAnswerXBlockMixin (197)
- Fixed submission download bug
- Use StudioEditableXBlockMixin (190)
- Run integration tests on travis (194)
- Add download all submissions (187)
- Separated upload and submit buttons in student submission upload UI
- add pull request template (193)
- Revert xblock-utils library (192)
- Add mitodl/xblock-utils as dependency (189)
- Add travis.yml (188)

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- Reference __init__ version (180)

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- Added new tests with mocking data (174)
- Changed ugettext to ugettext_lazy (178)
- Replace hard coded strings to be translatable in the future (i10n) (175)
- Converted SGA into django app and added tox base testing (170)
- Use the timezone of the platform as opposed to UTC for submissions&39; dates (169)
- Increase the height of the "Select a File" element (165)

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- Serialize block/course locators before sending to submissions API. (166)

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- preface id refs with strings, add tabindex to modals (163)

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- Fixed error "ValueError: invalid literal for int() with base 10: 'undefined'" (160)
- Fixed typo in README (158)