gnu: Add Sphinx RTD theme.

* gnu/packages/python.scm (python-sphinx-rtd-theme, python2-sphinx-rtd-theme):
  New variables.

gnu: Add python2-dbus.

* gnu/packages/python.scm (python2-dbus): New variable.

gnu: Add python-dbus.

* gnu/packages/python.scm (python-dbus): Add it. Makes use of dbus,
  dbus-glib and glib itself.

gnu: python-urwid: Remove Fedora mirror from source URI list.

* gnu/packages/python.scm (python-urwid)[source]: Remove Fedora mirror.

gnu: Add python-urwid and python2-urwid.

Based on preliminary work by Omar Radwan <toxemicsquire4@gmail.com>.

* gnu/packages/python.scm (python-urwid, python2-urwid): New variables.

Revert "gnu: python-matplotlib: Remove python-pillow input."

python-pillow is now fixed, so we can add it back.
This reverts commit dfbc33dceb803a3d54840613b08dc98f7be75f60.

Merge branch 'wip-gobject-introspection'

gnu: python-pyparsing: Update to 2.0.3.

* gnu/packages/python.scm (python-pyparsing, python2-pyparsing): Update to 2.0.3.

gnu: Add python-html5lib.

* gnu/packages/python.scm (python-html5lib, python2-html5lib): New variables.

gnu: Add python-isodate.

* gnu/packages/python.scm (python-isodate, python2-isodate): New variables.

gnu: python-scipy: Update to 0.15.0.

* gnu/packages/python.scm (python-scipy): Update to 0.15.0.

gnu: python-matplotlib: Update comments.

* gnu/packages/python.scm (python-matplotlib): Update comments as, with the
  patched 'gobject-introspection', setting LD_LIBRARY_PATH at run time is not
  anymore necessary.  It's still necessary at build time.

gnu: python-matplotlib: Remove python-pillow input.

* gnu/packages/python.scm (python-matplotlib): Remove python-pillow input as
  it currently is broken.

gnu: Add IPython.

* gnu/packages/python.scm (python-ipython, python2-ipython): New variable.

Merge branch 'core-updates'

Conflicts:
	gnu/packages/bootstrap.scm

Merge branch 'master' into core-updates

gnu: Fix or update a number of 'home-page' fields.

* gnu/packages/fltk.scm (fltk): Fix 'home-page'.
* gnu/packages/fonts.scm (font-bitstream-vera): Likewise, and fix
  license URL.
* gnu/packages/games.scm (gnubg, cmatrix, chess): Fix 'home-page'.
* gnu/packages/kde.scm (attica): Likewise.
* gnu/packages/mail.scm (fetchmail): Likewise.
* gnu/packages/popt.scm (popt): Likewise.
* gnu/packages/python.scm (python-mock): Likewise.
* gnu/packages/stalonetray.scm (stalonetray): Likewise.

packages: Add 'file-type' field to 'search-path-specification'.

Fixes <http://bugs.gnu.org/18033>.

* guix/packages.scm (<search-path-specification>): Rename 'directories'
  field to 'files'.  Add 'file-type'.
  (search-path-specification->sexp): Honor 'file-type'.
* gnu/packages/autotools.scm, gnu/packages/bootstrap.scm,
  gnu/packages/cross-base.scm, gnu/packages/games.scm,
  gnu/packages/gcc.scm, gnu/packages/glib.scm,
  gnu/packages/guile.scm, gnu/packages/man.scm,
  gnu/packages/perl.scm, gnu/packages/pkg-config.scm,
  gnu/packages/python.scm, gnu/packages/ruby.scm,
  gnu/packages/xfce.scm: Change 'directories' to 'files'.
* tests/packages.scm ("search paths"): Change 'directories' field to
  'files'.
* guix/scripts/environment.scm (for-each-search-path): Likewise.

Merge branch 'master' into core-updates

gnu: Add pysam.

* gnu/packages/python.scm (python-pysam, python2-pysam): New variables.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>