FIX: Non-integer indexing deprecation warnings
Use safe_as_int for input checking.
Merge branch 'master' of git://github.com/scikit-image/scikit-image into int_idx_patch
Remove unnecessary double import.
FIX: Use //= instead of /= to fix deprecation warnings in adapthist
Merge pull request #1005 from JDWarner/int_idx_patch

Fix NumPy non-integer indexing deprecation warnings