Merge pull request #206 from tessie/feature2

Bug 1074494 - Linkify front page copy for One and Done
Bug 1096435 - Clone task data is permanently saved under /create

Fix code to not set view.initial but rather to return the proper kwargs for the form
Bug 1087520 - Leaderboard for One and Done
Serve contribue.json
Add unit tests for metrics support functions
Merge pull request #217 from bobsilverberg/serve_contribute

Serve contribue.json
Merge pull request #218 from bobsilverberg/metrics_unit_tests

Add unit tests for metrics support functions
Bug 1014427 - Create Next and Previous task links
Merge pull request #219 from bobsilverberg/prev_next

Bug 1014427 - Create Next and Previous task links
Bug 1104102 - Next and Previous tasks - Update Profile to include links to next tasks
Fix for error when a user visits the finish task url without being logged in
Merge pull request #220 from bobsilverberg/prev_next_profile

Bug 1104102 - Next and Previous tasks - Update Profile to include links to next tasks
Bug 1032371 - Display users who have completed task on task detail page
Bug 1087266 - Add datetime for task execution in Task Activity view