Prepare for release on the v1.2.x branch.
Reduced the size of the example data.

Data is now on a single pressure level as this is all that is used
in any of the examples.
Merge pull request #20 from ajdawson/reduce-example-data-size

Reduced the size of the example data.
Add binary and set version number for v1.2.0.
Reset version number for maintenance branch.
Merge remote-tracking branch 'origin/v1.2.x'

* origin/v1.2.x:
  Reset version number for maintenance branch.
  Add binary and set version number for v1.2.0.
  Reduced the size of the example data.
  Prepare for release on the v1.2.x branch.
Increased version number for new development cycle.