Merge pull request #176 from Ghost141/challenges_rss

Challenges rss
change the parameter name.
change the parameter name.
Merge remote-tracking branch 'origin/merge_challenge_api' into merge_challenge_api

Conflicts:
	routes.js
Merge pull request #177 from LazyChild/merge_challenge_api

change the parameter name of getChallenge API.
Fixed code error.
Revert "Fixed code error."

This reverts commit 917dd5735045913f582be013381f3c54fefe0212.
Merge pull request #178 from Ghost141/challenges_rss

Fix undefined error in challenges.js
Get docusign envelop query needs to check is_completed  = 1
Rename all "contestId" in actions/challenges.js to "challengeId"