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**2015-10-28**
* Fixed bug in `cf.Units.conform`
* Changed `cf.Field.__init__` so that it works with just a data object
* Added `cf.Field.regrids` for lat-lon regridding using ESMF library
* Removed support for netCDF4-python versions < 1.1.1
* Fixed bug which made certain types of coordinate bounds
non-contiguous after transpose
* Fixed bug with i=True in `cf.Field.where` and in
`cf.Field.mask_invalid`
* cyclic methods now return a set, rather than a list
* Fixed bug in _write_attributes which might have slowed down some
writes to netCDF files.
* Reduced annoying redirection in the documentation
* Added `cf.Field.field` method and added top_level keyword to
`cf.read`
* Fixed bug in calculation of standard deviation and variance (the bug
caused occasional crashes - no incorrect results were calculated)
* In items method (and friends), removed strict_axes keyword and added
axes_all, axes_superset and axes_subset keywords
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