Made text resources available straight from module

- Added "dynamic Text" property to INancyModule
- Updated DefaultNancyModuleBuilder to assign a TextResourceFinder to
the new INancyModule.Text property
- Added tests to cover the new behavior of DefaultNancyModuleBuilder
- Added a Resource property to TextResourceFinder to let you get the
raw ITextResource instance that it wraps
- Added sample route to Aspnet hosting demo
- Cleaned up some files

Fixes #1475