stash trnaslations
Add new extrapolation modes.
Minor tweaks to aid clarity/simplicity.
rewrite example as doctest
Merge pull request #1156 from rhattersley/bilinear-new-modes

Add new extrapolation modes.
Expose extrapolation mode for bilinear regridding.
Merge pull request #1146 from jkettleb/cube_doc

small correction to documentation in iris.cube
Fix (and test) reference surface interpolation.
Merge nan fill_value.
Merge pull request #1160 from rhattersley/bilinear-extrapolate

Expose extrapolation mode for bilinear regridding.
Merge pull request #1152 from bjlittle/merge_with_nan_fill_value

Merge nan fill_value.
Add Cube.regrid()
Merge pull request #1162 from rhattersley/bilinear-regrid

Add Cube.regrid()
ENH: Implemented array structure identification functionality in
preparation for the next phase of structured PP/FF field loading.
Merge pull request #1150 from pelson/array_structure_identification

Implemented array structure identification functionality.
Group scalar coordinate rules of pp_rules into sectional functions.
Merge pull request #1151 from pp-mo/group_pp_rules

Group scalar coordinate rules of pp_rules into sectional functions.
Missing test file for LinearRegridder.
Merge pull request #1163 from rhattersley/test-linear-regridder

Missing test file for LinearRegridder.
translate units