Cosmetic: Fix header formatting

This tweaks the header formatting in reST so that we can use ---
for 3rd level headers.
Add explicit LICENSE file

The LICENSE is at the top of setup.py, but ... having a LICENSE
or COPYING file is more conventional. So this adds that.
Add quickstart and hacking docs
Fix to be more friendly
Linkificate the Python virtual environment text
Merge branch 'docs-me-now' of git://github.com/willkg/hy
Removing my name from the license.