Update PPA to get a working libgeos-dev
Merge pull request #634 from rhattersley/fix-ppa

Update PPA to get a working libgeos-dev
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
PEP 8 iris.exceptions
Merge pull request #628 from rhattersley/pep8-iris.exceptions

PEP 8 iris.exceptions
grib hind doc
NF - add 1D scatter plot functions.
Merge pull request #617 from ajdawson/scatter-1d

NF - add 1D scatter plot functions.
PEP 8 iris.quickplot
Merge pull request #547 from bblay/hinddoc

Improve documentation of GRIB hindcast workaround flag.
Merge pull request #626 from ajdawson/weighted-sum

Convert iris.analysis.SUM to a weighted aggregator.
Merge pull request #629 from rhattersley/pep8-iris.quickplot

PEP 8 iris.quickplot
ENH: Allow cube slicing by dimension index

Currently only coordinates can be used to slice a given cube.  Since
coordinates are not allways associated with dimensions of a cube, the
ability to specify dimension and or mix of coordinate and dimension is
added here to facilitate use.
changes made from review