Release 1.3.0
Bump version to v1.3.1-dev
Merge pull request #426 from pp-mo/v1x3_release

V1x3 release
Force mpl v1.2.0 for Travis-CI.
Merged v1.3.x branch into master.
Helper function for regridding that returns x and y coords.
Review actions. Moved tests and improved docstring.
Merge pull request #437 from esc24/regrid_helper

Helper function for regridding that returns x and y coords.
Travis-CI non git clone of Cartopy.
Merge pull request #436 from bjlittle/travis_no_clone_cartopy

Travis-CI non git clone of Cartopy.
Fixed ref to old scitools.org page.
Merge pull request #441 from pp-mo/scitools_pagefix

Fixed ref to old scitools.org page.
Added iris.tests.assertArrayAllClose for array testing with relative tolerance.
Merge pull request #440 from pp-mo/test_arrays_reltol

Added iris.tests.assertArrayAllClose
Add bilinear interpolation between rectilinear grids.
Includes review changes.
Merge pull request #442 from rhattersley/regrid-bilinear

Add bilinear interpolation between rectilinear grids.
Safely build PyKE rule base.
Merge pull request #435 from bjlittle/pyke_rule_compile

Safely build PyKE rule base.
Added cfchecker to travis-ci
Merge pull request #449 from esc24/cfchecks

Added cfchecker to travis-ci