Starting to get launchmon working.
bugfix for SPACK-20: add dependency bin directories to PATH

- Consolidated build environment stuff from package.py into
  build_environment.py

- package.py calls build_environment.py functions just before calling
  install(), in do_install()

- Organization is better b/c SPACK_xxxx environment variables are now
  in build_environment, the only place they're used.  Were previously
  cluttering globals.py.
Default SYS_TYPE should just be an unknown architecture.
Fix for SPACK-10: Spack now forks before install()

- this allows each install to have full control over its environment,
  and over spack.

- build process can do whatever it wants and doesn't affect main Spack
  process.
Merge pull request #6 in SCALE/spack from bugfix/SPACK-20-bin-directories-in-path to develop

# By Todd Gamblin
# Via Todd Gamblin
* commit '554ae9b3552a40ed253250bdebf548e4d8b01976':
  bugfix for SPACK-20: add dependency bin directories to PATH
Merge pull request #7 in SCALE/spack from bugfix/SPACK-10-fork-on-install to develop

# By Todd Gamblin
# Via Todd Gamblin
* commit 'b4fddad7eff448adf701fc9e88cf02cd6e582f15':
  Fix for SPACK-10: Spack now forks before install()
Better version wildcard handling, better spidering

- Allow version wildcards to match [_-.] instead of the exact separators
  the version was constructed with.
  - Handles the fact that boost versions are written both 1.55.0 and 1_55_0.

- Update spidering to handle parse errors and warn that Python < 2.7.3 has
  less robust HTML parsing abilities.
Status messages now show install and stage directories.
Better temp directory selection.

- Prefer tempfile.gettempdir(), then LC dirs like /nfs/tmp2
Fix SPACK-17: Remove install prefix if install() fails

- except clause now catches anything, not just exception

- sys.exit() changed to os._exit() to avoid interfering with unit tests
  and to avoid raising SystemExit exception when child processes quit.
Clean up commands and get rid of inconsistent --dirty options

- checksum  --dirty and create --dirty now changed to --keep-stage
- install   --dirty is now --keep-prefix
- uninstall --force now works properly

- commands use keyword args instead of package instance vars
  where possible (less weird package state)
SPACK-25: Add package for boost.  Works on Linux currently.
Merge pull request #9 in SCALE/spack from bugfix/SPACK-17-delete-install-dir-on-error to develop

# By Todd Gamblin
# Via Todd Gamblin
* commit 'b813b40c4fdccd593118024083f1e42b472f4e32':
  Clean up commands and get rid of inconsistent --dirty options
  Fix SPACK-17: Remove install prefix if install() fails
Merge pull request #8 in SCALE/spack from features/boost to develop

# By Todd Gamblin
# Via Todd Gamblin
* commit 'a0c91791c5ac995b80111a92c94d8fb760caa6e3':
  SPACK-25: Add package for boost.  Works on Linux currently.
  Better temp directory selection.
  Status messages now show install and stage directories.
  Better version wildcard handling, better spidering
Add Dong's 1.0.1 release URL to the launchmon package.
Merge branch 'features/launchmon' into develop
Make mrnet depend on boost.
Allow widths in spec format strings.
added mrnet-4.1.0 and stat-2.1.0
Bugfix in error message.