Convert iris.analysis.SUM to a weighted aggregator. Closes #595.
PEP 8 iris.quickplot
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
Remove workaround from filtering example
Merge pull request #647 from ajdawson/soi-aggregator

Remove workaround from filtering example.
Avoid version-specific formatting issues by checking data directly.
Merge pull request #648 from rhattersley/pandas-time-fix

Avoid version-specific formatting issues by checking data directly.
Merge pull request #633 from bblay/cellple

Convert Cell to a namedtuple
ne logic