Hack in pure-Python PP rules
Add GRIB support and fix remaining issues/tests.
Remove obsolete methods
Delete temp_test_output.txt

Fix to #462.
Convert post-item documentation to pre-item #: form
Merge pull request #618 from rhattersley/docstrings

Convert post-item documentation to pre-item #: form
Merge pull request #611 from rhattersley/rulegen

PP/GRIB load rules as a function
PEP 8 iris._cube_coord_common
PEP 8 iris.fileformats.ff
Merge pull request #621 from rhattersley/pep8-ff

PEP 8 iris.fileformats.ff
Merge pull request #620 from rhattersley/pep8-cube_coord_common

PEP 8 iris._cube_coord_common
PEP 8 iris._merge
Merge pull request #622 from rhattersley/pep8-iris._merge

PEP 8 iris._merge
Update PPA to get a working libgeos-dev
Merge pull request #634 from rhattersley/fix-ppa

Update PPA to get a working libgeos-dev
TestPPSave for 32-bit arch
PEP 8 iris.pandas
PEP 8 iris.palette
Convert iris.analysis.SUM to a weighted aggregator. Closes #595.
Merge pull request #627 from rhattersley/pep8-palette-and-pandas

PEP 8 iris.palette and iris.pandas