documented & revised vector
added kramdown markdown parser as dev dependency
updated README
minor vector revision
documented & revised display
README tweak
prepended non-code in lib with _
improved game template
explicit error without code.rb
display: updated docs, updated tests, fixed bugs
vector minor doc cleanup
platform abstract note
asset docs
sound: #pause, docs
Asset::[]
vector minor docs cleanup
fixed web image #width & #height
image docs
keyboard docs
keyboard docs example