Rename CroppedIterableInterval to HyperSlice

HyperSlice is a better name, as the underlying algorithm doesn't actually
crop the data, but simply creating 'HyperSlice' views on it.
Reference "map" op by a constant

We avoid asking for the Map.class object to allow optimizers to return an
alternative implementation that is *not* an instance of Map (or of a
subclass thereof).

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Slicewise: Update JavaDoc
SlicewiseUtils: Added Util class to get indices from axes
Using Slicewise.NAME instead of fixed "slicemapper"
SlicewiseRAI2RAI: Formatting
Merge pull request #49 from imagej/slicewise

Slicewise