add hashable slice objects
rename test_utils to test_utils_expr to comply with pytest
add slicing operators
slice child renamed to _child
numpy slicing
pandas slice
Slice.child -> _child again
into(tuple, (np.record, np.void, pd.Series))
python slice
bcolz, pytables slice
fix util->utils import
use iloc instead of loc and -1
pandas slice tests use iloc instead of loc
pandas: df.loc -> df.iloc in Slice
Merge pull request #724 from mrocklin/slicing

Add Slicing