Added documentation regarding v0.6.0
Re-arrangement of documentation for the v0.6.0 release.
Review actions.
Moved the feature interface documentation and tidied up some bad links.
Removed the introductory examples, which are now redundant.
Merge pull request #209 from pelson/basic_doc_changes

Added documentation regarding v0.6.0
Added the features example.
Set zorder in FeatureArtist.

Matplotlib v1.3.x removes the class attribute `zorder` from
`PathCollection` objects, meaning we need to hard-code the
value in `FeatureArtist` for compatibility with this version
and future versions.
Merge pull request #228 from ajdawson/feature-zorder

Set zorder in FeatureArtist.
Review actions: New logo, new example (from what's new section), tidied all examples, fixed broken links.
Fixed sort order of gallery.
Merge remote branch 'origin/feature_interface_docs' into v0.6.x

* origin/feature_interface_docs:
  Fixed sort order of gallery.
  Review actions: New logo, new example (from what's new section), tidied all examples, fixed broken links.
  Added the features example.
  Removed the introductory examples, which are now redundant.
  Moved the feature interface documentation and tidied up some bad links.
  Re-arrangement of documentation for the v0.6.0 release.

Conflicts:
	lib/cartopy/__init__.py
Merge remote branch 'upstream/v0.6.x' into HEAD

* upstream/v0.6.x:
  Fixed sort order of gallery.
  Review actions: New logo, new example (from what's new section), tidied all examples, fixed broken links.
  Set zorder in FeatureArtist.
  Added the features example.
  Removed the introductory examples, which are now redundant.
  Moved the feature interface documentation and tidied up some bad links.
  Review actions.
  Re-arrangement of documentation for the v0.6.0 release.
  Added documentation regarding v0.6.0
Updated version to 0.7.x