Pull R list_urls from upstream.

Merge branch 'releases/v0.11.0'

Merge branch 'releases/v0.10.0'

Version bump to 0.9.1

- Bugfixes for spack find
- 0.9.1 can read specs from current develop.

Tag Spack version 0.9

- Tagging a version to include all that's happened since 0.8.17

- This is in anticipation of merging `features/cflags` and
  `features/newarch`, which will break the spec format.

- 1.0 will likely come after those.

SPACK-87: enable disabled git fetch tests.

Spack version 0.8.17

Minor release with documentation updates to Master.

v0.8.16 Release Notes

=========================

5 new packages since 0.8.15:
---------------------------------
 - cram
 - metis
 - otf
 - ravel
 - scotch
 - Fix for SAMRAI fetch URL.

For packagers
---------------------
  - MPICH now sets up MPICH_CC, MPICH_CXX, etc. in dependent environment
    so that dependency builds use Spack compiler wrappers.
  - Simpler build error messages on fail (no more python stacktrace)
  - Disable CMake policy warnings in `std_cmake_args`.
  - Remove superfluous compiler wrapper links (g++ link interfered with icpc)
  - Several new packaging helper functions:
    - `install_tree`
    - `traverse_tree`
    - `force_symlink`

v0.8.15 Release Notes

=========================

100 new packages since 0.8.11:
---------------------------------
Mitos       gtkplus        mpfr          py-matplotlib        py-shiboken
R           harfbuzz       mpibash       py-mpi4py            py-sip
atk         icu            muster        py-mx                py-six
bison       icu4c          nasm          py-nose              py-sympy
bzip2       isl            netcdf        py-numpy             py-virtualenv
cairo       jdk            nettle        py-pexpect           python
cloog       lcms           pango         py-pil               qhull
dbus        libdrm         pcre          py-pmw               qt
dri2proto   libffi         pixman        py-pychecker         qthreads
flex        libgcrypt      ppl           py-pygments          readline
gasnet      libgpg-error   py-basemap    py-pylint            rose
gcc         libjpeg-turbo  py-biopython  py-pyparsing         ruby
gdk-pixbuf  libmng         py-cython     py-pyqt              tcl
geos        libxcb         py-dateutil   py-pyside            tk
git         libxml2        py-epydoc     py-pytz              util-linux
glib        libxshmfence   py-gnuplot    py-rpy2              vtk
gmp         libxslt        py-h5py       py-scientificpython  wget
gnutls      memaxes        py-ipython    py-scikit-learn      xcb-proto
gperf       mesa           py-libxml2    py-scipy             xz
gperftools  mpc            py-mako       py-setuptools        yasm

For users
---------------------
  - Support for Python and Python extensions.
  - Python extensions can be activated/deactivated in an installation.
  - Updated documentation
  - Clearer 'spack find' output
  - Bugfixes for mirroring
  - Graphing dependencies with spack graph
  - ROSE Compiler (http://rosecompiler.org)
  - New commands:
      - spack extensions
      - spack activate
      - spack deactivate
      - spack clean (behaves like old clean -d)
      - spack restage (behaves like old clean -w)

For packagers
---------------------
  - Package extensions, e.g.: extends('python')
  - Extensible activation/deactivation of extensions
  - Dependencies can set variables/build options for dependents
      - setup_dependent_environment()
  - Support fetch URLs with query strings.
  - New commands:
      - spack env
      - spack graph

Bugfix release

- spack inadvertently required git, hg, svn, and svnadmin.
- this version doens't require them unless they're used.