Upgrade to Minitest 5
Remove rcov task
Gemfile: Move template engines into a group
Mapping: Handle autoloaded modules
tilt/wiki.rb is no longer used
Use Bundler in tests
Mapping shouldn't accept options
Autoload all Tilt template classes
Add YARD
Tweak README.md
Start documenting tilt.rb
Move TEMPLATES into docs/
Show protected methods in YARD
Add more docs in Mapping and Template
Remove deprecation warnings #196