Merge pull request #24 from parndt/master

Removed outdated VERSION file.
Refactor internals of Princely class.
Refactored pdf_helper, made code much more DRY
Move Princely::AssetSupport to its own file.
Add coverage for Princely::Version, modify gemspec to suit.
Switched README to markdown and added syntax highlighting.
Added ability to toggle AssetSupport.

See https://github.com/mbleigh/princely/pull/23#issuecomment-13022988
and https://github.com/modsognir/princely/commit/5cc8458f13388c1f185e7e76140ea0bf779ea46c if it is still around
Recommend splitting out handlers and formats from template for #17.
Reorganise PdfHelper and AssetSupport into Princely namespace.
Use AssetSupport as a module.

Map stylesheets directly rather than using .each