Fix bug in challenge results api

1. Actually fix the dr points calculation bug in challenge results api.
Add mark_for_purchase check in challenge results api.
Fix bug in review opportunity api.
S-260474 Remove [] in topcoder reference.
Data Science Challenges API
Data Science Challenges API - Fixed error from merging
Merge pull request #346 from isvisv/dev

Dev
Merge pull request #348 from Ghost141/challenge_results_api_fix

challenge_results_api_fix
Renamed to /dataScience
Fix bug in challenge results api.
Merge pull request #349 from Ghost141/challenge_results_api_fix

Fix bug in challenge results api.
Merge pull request #347 from Ghost141/review_fix

Fix bug in review opportunity api.
Update challenge results api

1. Retrieve dr points of each submission from database instead of calculating it in code.
Merge pull request #350 from Ghost141/challenge_results_api_fix

Update challenge results api
Fixed checkNumber()
Fixed checkNumber()
Merge branch 'technology-2014-09-18'

Conflicts:
	apiary.apib