Merge pull request #1 from aria4larry/develop

optimize the Questions list, add pull to refresh and auto load more~
Merge pull request #2 from aria4larry/develop

Questions list loading indicator...
Merge pull request #2 from aria4larry/develop

Questions list loading indicator...
Merge branch 'master' of https://github.com/aria4larry/StackRanger
Merge pull request #5 from aria4larry/master

delete unused