Move development deps to gemspec (from Gemfile)
Reset prefix setting it to nil
Fix singleton R2AP::ViewHelpers.asset_path

Was relying on the singleton version of R2AP::ViewHelpers.assets_prefix
Update RSpec and add good config defaults
Add prefix examples for tasks & view_helpers specs
Prefix should not stay here (it's from the future)
Update specs for R2AP.config_ru
Let R2AP.config_ru respect the prefix
Merge branch 'custom-prefix'

Conflicts:
	lib/rails2_asset_pipeline.rb
Merge branch 'cleaner-config-ru'

Conflicts:
	lib/rails2_asset_pipeline.rb