Move code from hy.readline_helpers into new hy.completer.completion context
manager so we can "wrap" readline completion around REPL interaction.
documentation for some of the builtins
references #18
Style fixes.
Merge branch 'master' into pr/222
Jank @olasd's hack, clean up core.

 The core shall from now on be only for the core language bits. Macro
 bits shall live in hy.macros and in hy.compiler. This cleans up
 garbage.
Don't leave cruft around in sys.modules when an import fails.

Closes: #214, #225

Squashed from a bunch of commits by @olasd
Fix flake error
Adding NEWS entry
Preparing 0.9.9
Include hy files in the release.
0.9.10 release. Bugfix only.
Update NEWS.
Removes `setf` in favor of `setv`
Merge pull request #241 from rahmu/240

Removes `setf` in favor of `setv`
Provide bin scripts for both Windows and *nix

Summary: This update does away with the scripts in bin and changes
setup.py to use entry_points in cmdline.py for the scripts 'hy' and
'hyc'.

This fixes installing and running on Windows.

The tests are updated to run the 'hy' script produced by setup.py
and not from bin/hy. This is more correct and makes the tox tests
run on both Window and *nix.

For running hy or nosetests directly in the source tree, you do have
to run 'python setup.py develop' first. But since tox runs and builds
dists, all tox tests pass on all platforms.

Also, since there is no built-in readline on Windows, the setup.py
only on Windows requires 'pyreadline' as a replacement.

Switched from optparse to argparse in cmdline.py

Instead of trying to manually separate args meant for
hy from args meant for a hy script, this switches from
optparse to argparse for the CLI.

argparse automatically peels out args meant for hy and leaves
the rest, including the user hy script in options.args.

This fixes the issue @paultag found running "hy foo" where
foo is not a real file. Also added a test that makes sure
trying to run a non-existent script exits instead of dropping
the user into the REPL.

Added argparse as setup.py resource (and removed from tox.ini) as well as removed uses of deprecated setf