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**2015-01-05**
* Added netCDF4 compression options to `cf.write`.
* Added `__mod__`, `__imod__`, `__rmod__`, `ceil`, `floor`, `trunc`,
`rint` methods to `cf.Data` and `cf.Variable`
* Added ceil, floor, trunc, rint to `cf.Data` and `cf.Variable`
* Fixed bug in which array `cf.Data.array` sometimes behaved like
`cf.Data.varray`
* Fixed bug in `cf.netcdf.read.read` which affected reading fields
with formula_terms.
* Refactored the test suite to use the unittest package
* Cyclic axes functionality
* Documentation updates
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