Update requirements.txt and setup.py to use rply upstream.

Closes #364.
Add astor to install_requires.

`hy --spy` fails on hy 0.9.11.

    $ hy --spy
    hy 0.9.11
    => (type "hy")
    Traceback (most recent call last):
      File "/usr/local/lib/python2.7/dist-packages/hy/cmdline.py", line 68, in print_python_code
        import astor.codegen
    ImportError: No module named astor.codegen
Convert stdout and stderr to UTF-8 properly in the run_cmd helper.
Explicitly skip the skipped test in test_bin.
Merge pull request #369 from berkerpeksag/skip-test

Explicitly skip the skipped test in test_bin.
Merge pull request #328 from berkerpeksag/add-astor

Add astor to install_requires.
Fix for readline REPL problem Darwin Python3

On OS X Mavericks, the Hy REPL doesn't allow the 'b' character when
running with Python 3.3. This appears to be a common problem
for Darwin and readline as mentioned in this post

http://superuser.com/questions/297527/cant-type-the-b-letter-in-python-shell-in-os-x