Update new relic ruby agent in Gemfile.lock
check assessment dependent_id nil or 0
remove used std_tag in user course
update exp transaction only once
Merge pull request #116 from jsyeo/jsyeo-newrelic-update

Update new relic's ruby agent.
Merge branch 'development' of github.com:Coursemology/coursemology.org into development
Merge branch 'development' of github.com:Coursemology/coursemology.org into Deploy