Merge branch 'develop'
Merge branch 'develop'
Merge branch 'develop'
Release v0.8.10
Add ability to get subparser by name from argparse
"spack info -r" is now "spack package-list"

- too much going on in this command, and it made subcommand parsing weird.
- information printed is the same but info and package-list are really different commands.
Update libmonitor URL to point to google code.
Bump ImageMagick version
Merge branch 'features/python' into develop
Packages for gcc and its dependencies.
Working GCC package.
Fix for missing format_doc in package-list command.
Fix inadvertent requirement of hg, svn, git, etc.
Merge branch 'hotfix/vcs-not-required' into develop
Change to faster gcc mirror that allows spidering.
Improved website scraping.
Add package for Sandia QThreads.
URL parsing improvements
'spack urls' debugging command, more consistent URL extrapolation.

- spack urls inspects all URLs in packages, prints out colors to show how they are parased.
- URL extrapolation test added.
- Extrapolation is more consistent now.
- Extrapolation handles more complex URLs.
- More test cases for extrapolation.
Python 2.6 fix for Mac OS