Merge pull request #5 from dhruvasagar/master

Added support for HAMLJS
Don't detect *.jst.eco files, detect *.ejs instead
Merge pull request #7 from AndrewRadev/dont-detect-eco-files

Don't detect *.jst.eco files, detect *.ejs instead
Add hamljs fileextension to ftdetect/jst.vim

To automatically use the right file type for hamljs files, which are
supported since e111089.
Merge pull request #8 from ohcibi/master

Add hamljs fileextension to ftdetect/jst.vim