wrapped state improperly attributed #341

Changed wrapped states to 'wrapped', 'unwrapped', and 'unknown'
allowing explicity comparisons for selectiong of wrapping operations.
fixes for numpy 1.9.1 #342

Fixed indexing errors related to the new NumPy version. Floating point errors are occurring, but 1.8.2 is still the default NumPy version.
Merge branch 'next' into i338-field-objects-for-dataset

Conflicts:
	src/ocgis/interface/base/field.py
	src/ocgis/test/test_ocgis/test_interface/test_base/test_dimension/test_spatial.py
	src/ocgis/test/test_simple/test_simple.py