Add Makefile.

I have add a makefile, and I think it is helpful for people who doesn't have codekit, like me.
Now it will combine all js to timeline.js, and it uses yui-compressor to compress it to timeline-min.js
It also compress all locale js.
It uses lessc to compile and compress all less files.
I wish you could accept it.

However, I don't know how to build timeline-embed.js

BTW. you are really diligent!