expr: add basic Map operation
compute: python map
squashme
compute: pandas map
get apply from compatibility for py3 support
add apply to compatibility
expr: apply term
fix python map tests
compute: python apply
add extra apply on table test for python
compute: pandas apply
add datetime python compute example
expr: map/apply docstrings
compute: pandas, fix relabeling mutation
use lambda instead of apply
remove TableExpr.apply
Merge pull request #295 from mrocklin/arbitrary-functions

Arbitrary functions