updated team members section
updated Wang Qiang's information
updated boss's description
minor styling changes
updated hung's bio
updated hung's bio pic
Merge pull request #118 from weiqingtoh/wq-dev-about-update

Update Team Members in About Us Page
enable search by tag for all courses
Merge branch 'development' of github.com:Coursemology/coursemology.org into development
add cmd to programming language, and add python 3.4
fix #113 for uploading files in mission/training/submission
fix new grading email notification
remove used methods in mail job
refactor background job
refactor announcement
mail job refactoring
refactoring comments notification
fix rendering coding evaluation result for mission
fix uninitalized constant when creating comment
fix annotation email notification