New changes for v0.4

Adding alphanumeric hash support.
Deprecating chihuahua and elegant themes.
Bump up the version numbers
Using a better approach to url keys
Update GeSHi version
Add support for goo.gl URL shortener
Bump up the version
Adding a donate button :)
Update the install script to use MyISAM. Logic for unique url keys added.
Add missed out unique component
Add template level caching
Add some hit counter logic
Add trending pastes feature
Add paste title feature
Fix defect #5 - newlines issue in json. Add CDATA section for xml outputs.
Excluding newline filter for normal view
Show active trend in the filter menu
Change header tagline for trending page
Add/change project home URL
Some pixel craziness!
Cache GeSHi output