Merge pull request #25 from cloudspokes/master

latest
Merge pull request #85 from wangzhihao/master

Add register challenge api
Active Billing Accounts API
Merge pull request #86 from muzehyun/master

Active Billing Accounts API
update routes.js for active billing api.
Merge pull request #87 from Ghost141/master

update routes.js for active billing api.
Member Registration API Update
Merge branch 'registration_api_update'
Merge pull request #26 from cloudspokes/master
Checkpoint API
Merge branch 'master' of github.com:lsentkiewicz/tc-api

Conflicts:
	actions/challenges.js
	routes.js
Merge pull request #88 from lsentkiewicz/master

Checkpoint API
update tests to reset ldap
Merge branch 'clean_ldap'
commented out activeBillings for now.
Add admin check for active billing api.
Merge pull request #89 from Ghost141/master

Add admin check for active billing api.
Merge pull request #27 from cloudspokes/master
checkpoint API update
Update get_checkpoint_detail query to return winning submission only.