S-175084-review opportunity listing

- Output of https://www.topcoder.com/direct/contest/detail.action?projectId=30041788
- Only show review opportunities list since API was being developed while this F2F was launched. and also since API for apply to review position is being discussed http://apps.topcoder.com/forums/?module=Thread&threadID=817954&start=0
- Apply to review position feature will be on next F2F Challenge
- Please create review-opportunities page from wp-admin and try /review-opportunities/develop/ and  /review-opportunities/design/, 
- There're a lot of changes on old review*php  they were never used.