Updated to 0.3

Squashed commit of the following:

commit 2f0ec26dbce457ad61f9b332b3440a2c5dc7c6f8
Author: Felipe Lavín Z <felipe@yukei.net>
Date:   Fri Dec 13 00:56:03 2013 -0300

    updated readme for new version

commit d2f25920275094e5b9a6d39678e5515e5185203e
Author: Felipe Lavín Z <felipe@yukei.net>
Date:   Fri Dec 13 00:53:20 2013 -0300

    remove leftover code used with old image uploader

commit ed3b102256585bd3e95199dec147d6ee0f4c41d6
Author: Felipe Lavín Z <felipe@yukei.net>
Date:   Fri Dec 13 00:45:20 2013 -0300

    fix #7

commit 00b89301fe2ff1ad9bd81880b9487d5639abac9a
Author: Felipe Lavín Z <felipe@yukei.net>
Date:   Thu Dec 12 23:34:09 2013 -0300

    using codemirror 3.20; partially fixes #6