ICONS! closes #3

made them myself :)
footer label with tab and window counts

remove need to pass tabs array around internally
[#3] swankier icons
simpler build process

copy jquery instead of concat and uglify. compile directly to dist.
remove dist from git.
remove hotkey from initial release
grunt: template manifest and popup + imagemin
update package.json
simplify gruntfile

remove test stuff and targets where possible. updated 128 icon.