show all the explanations if answer is correct
change implementation to show only for MRQ questions
Merge pull request #222 from wangqiang1208/feature/training-correct-answer-explanation

show all answer explanation for MRQ questions
fixed small markup issue
renamed class for correctness
shifted css-class for correctness
show hints of private test cases in missions
refine code as hound suggests
Merge pull request #227 from weiqingtoh/bug/mission-attempt-alignment

Bug/mission attempt alignment
use a function to set hints for both mission and training
refine code
Add javascript style checking to hound🐶
remove empty answers
Merge pull request #229 from wangqiang1208/bugfixing/mission-hints-for-private-test

show hints of private test cases in missions
Merge pull request #231 from jsyeo/jsyeo-enable-js

Add javascript style checking to hound🐶
strip string before compare
Merge pull request #233 from wangqiang1208/bugfixing/survey-summary-blank-answer

remove empty answers in survey summary
Merge branch 'development' of github.com:Coursemology/coursemology.org into Deploy