Datascience

* Changed signature of `apply`, `hist`, and `bin` to accept multiple columns without a list
* Deprecate `hist` argument name `counts` in favor of `bin_column`
* Rename various positional args (technically could break some code, but won't)
* Unified `with_column` and `with_columns` (not a breaking change)
* Unified `group` and `groups` (not a breaking change)

* Added "Table.remove"

* Added `proportions_from_distribution` method to `datascience.util`.
(993e3d2)
* `Table.column` now throws a descriptive `ValueError` instead of a `KeyError`
when the column isn't in the table. (ef8b319)

**Breaking changes**

* Change default behavior of `table.sample` to `with_replacement=True` instead
of `False`. (3717b67)

**Additions**

* Added `Map.copy`.
* Added `Map.overlay` which overlays a feature(s) on a new copy of Map.
(315bb63e)

* Remove rogue print from `table.hist`

* Added predicates for string comparison: `containing` and `contained_in`. (231)