- enable to filter by tag
- add tags below challenge name
- update platforms list style on challenge detail
resolve conflict

- Merge ajax_func.php
- Clean up script-challenges.js
- Clean up page-challenge-details.php
added challenge-tags.js

added missing challenge-tags.js
- move code of challenge-tags.js to script-challenges.js
- deleted challenge-tags.js file
- removed challenge-tags.js from script-register.json
Clean up code formatting.
- re-indent script-register.json
- re-order script-challenges.js to below jquery.choosen.js plugin
Fix error handling in tags error handling
Merge branch 'pemula-S-187130-filter-by-tag' of github.com:topcoderinc/tc-site into pemula-S-187130-filter-by-tag

Conflicts:
	wp-content/themes/tcs-responsive/config/script-register.json
Hide challenges tags search
Merge pull request #222 from topcoderinc/pemula-S-187130-filter-by-tag

Filter by tags