Support for pig 0.10, 0.11, comments & more completions/keywords

Hello,

First, thanks for writing that sublime text plugin. Really handy!

I have made a few modification that I think they may be useful for others as your repository is the one in http://wbond.net/sublime_packages/community
I have added:
- new completions items (pig 0.10, 0.11)
- support for comments
- syntax highlighting for parameters/variables
- JSON development files to produce some of .plist (a bit more easy to extend and add new keywords ...)

I have not being using Sublime Text 2 for long, but this looks to be working fine so far.
Happy to help if you're planning to make more changes to the plugin.

Cheers
Guillaume