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
Reductions on multiple dimensions
fix util->utils import
fix util->utils import
use iloc instead of loc and -1
clean up around Reduction(axis=None) default

1.  Server tests
2.  docs
3.  std/var __init__
pandas slice tests use iloc instead of loc
Python count doesn't count missing values
numpy count treats nan as missing value
pandas: df.loc -> df.iloc in Slice
Merge branch 'master' into array-reductions