expr: Map.label short-circuits old map
Merge branch 'master' of github.com:ContinuumIO/blaze
Test relabel on Series objects
Implement relabel compute on Series and clean up a bit
Test map with rename
expr: Expr.project used to simplify graphs

Classes like Column, Project, Merge can all project more intelligently
than by just wrapping around another Projection.
expr: py3 import unicode from compatibility
expr: merge.project(list-of-columns) fixed and tested
Test failing on renaming a series with multiple names fails
Merge pull request #519 from cpcloud/relabel-series-511

BUG: Allow renaming of a column after mapping
Merge branch 'master' of github.com:ContinuumIO/blaze
into: list <- numpy - better datetime handling

Nanosecond datetimes converted to datetime objects, not Longs
into: DataFrame <- CSV support datetimes with parse_dates
into: exhaustive test - add datetime support
into: exhaustive test with basic compute
into: exhaustive test - refactor data sources
into exhaustive: remove csv from base targets
mongo: tests skip if no mongo server running
python 3 compatibility
into: exclude into(nd.array, *) test with datetimes