Version 0.1: Initial upload
Modified：syntax/PKGBUILD.vim
Fetch the latest file from pacman.git/contrib
Add PKGBUILD template
When creating new file named PKGBUILD, a template will fill the buffer.
Add github-flavored-markdown-type README file
Add filetype detect file and 2 commands

1. Add file ftdetect/PKGBUILD.vim to detect filetype.
2. Try to parse .AURINFO as PKGBUILD filetype
3. Add 2 commands -- :UpdPkgSums and :MkAur
4. Update README.md
Refine templates/PKGBUILD
Add 2 new keywords of 'options' for syntax/PKGBUILD.vim
Add syntax file for '.PKGINFO' and '.AURINFO'

1. Add file syntax/PKGINFO.vim for '.PKGINFO' and '.AURINFO'.
2. Parse .INSTALL as shell filetype.