Added support for sys.prefix based udunits xml path
cube math broadcasting
ENH: Tests for cube broadcasting.
More testing
Review actions
Removed redundant broadcasting tests
Add tests for transposable cubes.
Merge pull request #10 from rhattersley/test-transpose

Add tests for transposable cubes.
Merge pull request #1076 from esc24/cubemathbroadcast

Cube math broadcasting
Merge pull request #1072 from esc24/udunits_xml_path

Added support for sys.prefix based udunits xml path
Merge branch 'merge_in_1.6.x' into latest

Conflicts:
	lib/iris/analysis/maths.py
	lib/iris/tests/unit/analysis/maths/__init__.py
	lib/iris/tests/unit/analysis/maths/test_add.py
	lib/iris/tests/unit/analysis/maths/test_divide.py
	lib/iris/tests/unit/analysis/maths/test_multiply.py
	lib/iris/tests/unit/analysis/maths/test_subtract.py