implement code to install the default configuration file on import
updated documentation to reflect new behavior of on-import configuration setup
removed some debug code
added encode to subprocess communicate call to support py3.x
typo fix pointed out by @mdboom
Generation of configuration error message improvements
fixed encode/decode to making error mesages helpful in 2.x and 3.x
updated setup_helpers to run in build dir - this fixes py 3.x because before the 2to3ed version did not get run
Adjusted astropy/wcs/docstrings.py to work with configuration file builder on py 3.x
Moved ref_* scripts in coordinate accuracy tests to generate_ref_ast module.

This is necessary because the default configuration generation process visits all packages, including the test packages, so the import has to succeed even if pyast is not installed.
Adds the tocdepth directive to the main index so that the 'What's New' link can be rendered as a heading, but not appear in the sidebar TOC.  Also adds a small sphinx extension to work around the bug I seem to have found in Sphinx.  Will make a bug report to Sphinx describing the issue.
Merge pull request #528 from eteq/quantity-add-numerical-converters

Add numerical converters to Quantity
Fix #596.  Store the INFO's text content properly.
Fixes the issue with pip; this will however change the default behavior of setup.py install now that we're actually using the setuptools install.  I don't think this should have any adverse affects.
FITS unit format doesn't support floating-point powers, only fractional powers, so care must be taken when the power is represented by a floating-point number.
Make steradians equivalent to radians ** 2.  Fixes #599.
Update the FITS unit parser to handle whitespace after the division operator.
Fix for Python 2.6 for missing functionality in the fractions stdlib module.

Conflicts:
	astropy/units/core.py
Merge pull request #599 from mdboom/unit/steradian_radian

Make steradian and radian ** 2 units equivalent?
Merge pull request #602 from mdboom/unit/fits-parser-whitespace-handling

Improve whitespace handling in astropy.unit.Unit FITS format string parsing?