Cis

This update adds support for Aerosol and Cloud CCI v3 files.

- All new `cis info` command provides much more detailed information about ungridded data variables and enables multiple variables to be output at a time.
- Updated a number of routines to take advantage of Iris 1.8 features. In particular gridded-gridded collocation using the nearest neighbour kernel should be significantly faster. Iris 1.8 is now the minimum version required for CIS.
- Gridded-ungridded collocation now supports collocation from cubes with hybrid height or hybrid pressure coordinates for both nearest neighbour and linear interpolation kernels.
- Built-in support for reading multiple HadGEM .pp files directly.
- All new API and plugin development documentation, including a number of tutorials

Bugs fixed
- JASCIS-253 - Any ungridded points which contain a NaN in any of its coordinate values will now be ignored by CIS
- JASCIS-250 - Multiple HadGEM files can now be read correctly through the new data plugins.
- JASCIS-197 - Gridded-gridded collocation now respects scalar coordinates
- JASCIS-199 - Aggregation now correctly uses the bounds supplied by the user, even when collapsing to length one coordinates.
- Speed improvement to the ungridded-gridded collocation using linear interpolation
- Several bug fixes for reading multiple GASSP ship files
- Renamed and restructured the collocation modules for consistency
- Many documentation spelling and formatting updates
- Many code formatting updates for PEP8 compliance

Documentation updates, moving towards 1.2 release.

First release candidate for v1.2.

This minor release primarily contained bug fixes and documentation updates.

Bugs fixed
- JASCIS-181 - Updated eval documentation
- JASCIS-239 - Documented the requirement of PyHamCrest for running tests
- JASCIS-249 - CIS will now accept variables and filenames (such as Windows paths) which include a colon as long as they are escaped with a backslash. E.g. `cis plot my_var:C\:\my_file.nc`.
- Occaisonly HDF will exit when reading an invalid HDF file without throwing any exceptions. To protect against this the HDF reader will now insist on an .hdf extension for any files it reads.