Robust controllers handling empty categories
Category search checks if user has chosen a category
Redirects user to root path if no result is found.
Minor
Merge pull request #91 from g0v/feature/robustness

Feature/robustness
"index RWD with mobile share button"
Merge pull request #92 from g0v/feature/index-RWD

"index RWD with mobile share button"
Can handle 公司行號 or 營登項目
Adjust unicorn.rb for Sequel