add uglify to the npm package def. ignore errors in the `make clean` target: rm will fail when the file did not exist (i.e. was cleaned before) and we are okay with that
wip: inline & display math
remove console.log
use `$ ... $` for inline, `$$ ... $$` for display

test is also added
math : refactor to renderer
Fixed empty-end-cell bug chjj/marked#357
Merge tag 'v0.3.0'
Merge tag 'v0.3.1'
Merge remote-tracking branch 'remotes/chjj-original/master'
Merge remote-tracking branch 'remotes/smilekzs/mathjax'

Conflicts:
	lib/marked.js
Merge remote-tracking branch 'remotes/benracine/table-ending-in-empty-cell'