1.0.0b1

This is a beta release; these changes will appear in the 1.0.0 release.

• #255 adds support for filtering by PostgreSQL network operators.
• #257: ensures additional attributes specified by the user actually exist on
  the model.
• #363 (partial solution): don't use COUNT on requests that don't require
  pagination.
• #404: Major overhaul of Flask-Restless to support JSON API.
• Increases minimum version requirement for python-dateutil to be strictly
  greater than 2.2 to avoid parsing bug.
• #331, #415: documents the importance of URL encoding when using the like
  operator to filter results.
• #376: add a not_like operator for filter objects.
• #431: adds a url_prefix keyword argument to the :class:APIManager
  constructor, so one can specify a URL prefix once for all created APIs.
• #449: roll back the session on any SQLAlchemy error, not just a few.
• #432, #462: alias relation names when sorting by multiple attributes on a
  relationship.
• #436, #453: use __table__.name instead of __tablename__ to infer the
  collection name for the SQLAlchemy model.
• #440, #475: uses the serialization function provided at the time of invoking
  APIManager.create_api to serialize each resource correctly, depending
  on its type.
• #474: include license files in built wheel for distribution.
• #501: allows empty string for url_prefix keyword argument to
  APIManager.create_api.
• #476: use the primary key provided at the time of invoking
  APIManager.create_api to build resource urls in responses.