dataportal v0.2.0 (2015-09-15)
------------------------------

API Changes
+++++++++++

* `DataBroker[]` for slicing by scan ID(s) or recency
*  `DataBroker()` for building queries from keyword arguments
* `get_events`  return events generator
* `get_table`  return DataFrame
* `Header`, vastly simplified: it is merely `Document` with a dedicated
  constructor that accepts a Run Start Document
