Fixes for Python 3.3

[astrofrog]

With these changes, I can run asv with Python 3

[astrofrog]

@mdboom - there is one more issue that I'm not sure how to address. When it installs astropy, it detects the system installed version and tries to uninstall it and fails:

Unpacking ./astropy
  Running setup.py egg_info for package from file:///Volumes/Raptor/asv/astropy-benchmarks/astropy
    Downloading http://pypi.python.org/packages/source/d/distribute/distribute-0.6.28.tar.gz
    Extracting in /var/folders/zq/64w93jcj22366sbdv9wqvh6c0000gq/T/tmppstoj6
    Now working in /var/folders/zq/64w93jcj22366sbdv9wqvh6c0000gq/T/tmppstoj6/distribute-0.6.28
    Building a Distribute egg in /private/var/folders/zq/64w93jcj22366sbdv9wqvh6c0000gq/T/pip-npe8zj-build
    RefactoringTool: Skipping implicit fixer: buffer
    RefactoringTool: Skipping implicit fixer: idioms
    RefactoringTool: Skipping implicit fixer: set_literal
    RefactoringTool: Skipping implicit fixer: ws_comma
    [snip]
    /private/var/folders/zq/64w93jcj22366sbdv9wqvh6c0000gq/T/pip-npe8zj-build/distribute-0.6.28-py3.3.egg
    Freezing version number to astropy/version.py

    warning: no files found matching 'astropy/utils/misc/data/.hidden_file.txt'
    warning: no previously-included files found matching '*.pyc'
    warning: no previously-included files found matching '*.o'
    no previously-included directories found matching 'docs/_build'
    no previously-included directories found matching 'build'
Requirement already satisfied (use --upgrade to upgrade): numpy in /Volumes/Raptor/Library/Python/3.3/lib/python/site-packages (from astropy==0.3.dev4071)
Installing collected packages: astropy
  Found existing installation: astropy 0.2.5
    Uninstalling astropy:
Cleaning up...
Exception:
Traceback (most recent call last):
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/shutil.py", line 522, in move
    os.rename(src, real_dst)
PermissionError: [Errno 13] Permission denied: '/var/folders/zq/64w93jcj22366sbdv9wqvh6c0000gq/T/pip-y9dtaw-uninstall/opt/local/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/site-packages/astropy'

I'm surprised it even knows about the system version since it's supposed to be in a virtualenv, right?

[mdboom]

Thanks. The test coverage obviously needs some work...

As for the last thing, I think there's something deeper going on -- I'll have a look.

[mdboom]

The virtualenvs are created with --no-site-packages such that they shouldn't have access to the system site-packages (which is actually the default behavior as of virtualenv 1.11). What version of virtualenv do you have installed? The snippet you've posted -- is that from ~/.pip/pip.log or something? It doesn't look like the output of asv...

[astrofrog]

@mdboom - just saw your question above - the output above is the captured stdout from asv.