Support lazy operations in cube.collapsed.
Changed iris.cube.Cube.coord() and iris.cube.Cube.coords() to accept coord name
string or coord instance as first kwarg

small fixes
Merge pull request #932 from niallrobinson/coord_dims_with_str

Changed Cube.coords() and Cube.coord_dims() to accept a name or coord
Forced .travis.yml to latest biggus (with 'var' and 'Aggregation.masked_array').
Merge pull request #996 from pp-mo/lazy_collapses

Support lazy operations in cube.collapsed.
Merge commit 'f47268f' into merge16fix

Conflicts:
	lib/iris/__init__.py
	setup.py
Merge pull request #997 from SciTools/v1.6.x

v1.6.x
concat mask
lic date
nan fill
data_is_merged
np fill
Remove obsolete IrisTest._assert_cml().
Merge pull request #1006 from rhattersley/remove-obsolete-test-method

Remove obsolete IrisTest._assert_cml().
Show full reference file path on test failure.
Sphinx data documenter for instances.
Merge pull request #1009 from bjlittle/sphinx_opaque_agg

Sphinx data documenter for instances.
Merge pull request #1007 from rhattersley/show-path-in-test-failure

Show full reference file path on test failure.
Merge pull request #1002 from bblay/conc-mask

concat mask
Changes to raise exceptions when comparing bounded datetime cells