Added support for UM fieldsfile ancillary files trunkated with ieee.
Add netCDF export support for transverse Mercator.
Handle directory creation race condition.
Merge pull request #742 from rhattersley/transverse-merc-to-nc

Add netCDF export support for transverse Mercator.
Merge pull request #743 from rhattersley/makedirs-race-fix

Handle directory creation race condition.
Merge pull request #740 from pelson/ancillary_ieee_32

Added the magic lines to support UM ancillary files trunkated with the UM utility ieee.
Corrected 'temperature' var name to 'air_pressure', plus a couple of PEP8 changes
Merge remote branch 'upstream/v1.5.x'

* upstream/v1.5.x:
  Handle directory creation race condition.
  Add netCDF export support for transverse Mercator.
  Added support for UM fieldsfile ancillary files trunkated with ieee.
Merge remote branch 'upstream/master'

* upstream/master:
  Ensure consistent memory layout for checksums.
Respect major/minor axes when converting to Cartopy.
Merge pull request #748 from rhattersley/fix-geogcs

Respect major/minor axes when converting GeogCS to Cartopy.
BUG: Fixed typo in OSGB.
Support for projection_origin and central_meridian
Merge pull request #754 from esc24/tmerc_fix

NetCDF loader allows both forms of the transverse Mercator arguments.
Merge pull request #751 from cpelley/transverse_merc_load_fix

BUG: Fixed typo in OSGB definition
Merge branch 'master' of github.com:SciTools/iris

* 'master' of github.com:SciTools/iris:
  Refactor common code and fix for PEP8 1.4.6.
  Added flexibilty when saving integer types to netCDF3
Merge remote branch 'upstream/v1.5.x'

* upstream/v1.5.x:
  Support for projection_origin and central_meridian
  BUG: Fixed typo in OSGB.
  Respect major/minor axes when converting to Cartopy.
  Corrected 'temperature' var name to 'air_pressure', plus a couple of PEP8 changes