Cryptocat 2.1.12

- Fixed some non-critical security issues reported by Steve Thomas that
slightly reduce the bits of entropy in OTR authentication. Updating is
recommended.
- Fixed a pseudo-random number generator bug that causes some bias and
wastes entropy. Updating is recommended.
- Fixed a user interface bug that would make nicknames hard to read
under certain circumstances.
- Fixed a user interface bug that would sometimes show jagged-looking
login text.