Integer array slicing.

Robust AFL cross join
Update version reference
Multiattribute integer index slicing
unique() method
robust AFL uniq
Preserve index in todataframe(), more robust methods
Align mismatched arrays in dot(), if possible
Merge branch 'master' of git://github.com/Paradigm4/SciDB-py
Array concatenation
Documentation
Negative operator
Mask dtype fix for new numpy
any, all, integer cast, groupby sugar
remove, ls methods
percentile method
Add collapse method. Do not collapse by default during boolean masking
Tests for ls, remove, percentile
WIP. Utilities for bio use case
Pandas merge
left_on/right_on kwargs of merge
Fix datetime parsing with new numpy version