v1.3.0: ISC license, credits, new fixes

new fixes:
- http://meta.stackoverflow.com/q/143973: Images can be pushed outside
the boundaries of a post by using nested lists
- http://meta.stackoverflow.com/q/214706: The branch prediction answer
is overflowing
- extended "MathJax in suggested question titles" fix to user profile
summary pages
other changes:
- add explicit ISC-style free license
- add credit notes to fixes based on code by others
- adjust line break to (mostly) fit under 80 columns
- reorder list of fixed in README to match code
v1.3.1: merge v1.2.1 from master branch, +1 fix
v1.3.2: testing fix for accidentall comment submits
v1.3.3: comment enter fix working now
v1.3.4: Opera compatibility, simpler comment enter fix
make comment fix work for edits too
enable comment enter fix unconditionally
fix typo causing enter to submit *any* textarea
v1.3.7: new fixes, better install instructions
release v1.3.8 as v1.4.0