Release 1.3 - OMG WTF have we done!!

+ General changes

  - All references to psyco have been removed as it doesn't support
    64-bit and was causing problems in Python 2.7.3.
  - A new document, :doc:`new_vendors`, has been added to use as
    checklist for adding new vendor support to Trigger.
  - Added `Allan Feid <https://github.com/crazed>`_ as contributor for
    his *crazed* ideas.

+ :feature:`10` The following changes have been made within
  `~trigger.changemgmt`, which provides Trigger's support for bounce
  windows and timezones, to move the bounce window settings into
  configurable data vs. static module.

  - The Bounce window API totally overhauled. Bounce windows are no
    longer hard-coded in `~trigger.changemgmt` and are now configured
    using ``bounce.py`` and specified using :setting:`BOUNCE_FILE`.
    The interface for creating `~trigger.changemgmt.BounceWindow`
    objects was greatly simplified to improve readability and usage.
   - Added sample ``bounce.py`` to ``conf/bounce.py`` in source
     distribution
   - New setting variables in ``settings.py``:

     - :setting:`BOUNCE_FILE` - The location of the bounce window
       mapping definitions. Defaults to ``/etc/trigger/bounce.py``.
     - :setting:`BOUNCE_DEFAULT_TZ` - Default timezone for bounce
       windows. Defaults to ``'US/Eastern'``.
     - :setting:`BOUNCE_DEFAULT_COLOR` - The default bounce risk-level
       status color. Defaults to ``'red'``.

+ :feature:`55` The following changes have been made within
  `~trigger.netdevices` to make it easier to populate
  `~trigger.netdevices.NetDevices` from arbitrary sources by
  implementing pluggable loaders.

  - The module has been converted into a package.
  - All hard-coded metadata parsing functions and associated imports
    have been replaced with loader plugin classes. Filesystem loaders
    provided by default for JSON, XML, Sqlite, Rancid, and *new*:
    CSV!). The bare minimum config for CSV is a newline-separated CSV
    file populated with "hostname,vendor" - New configuration setting:
    :setting:`NETDEVICES_LOADERS` used to define a list of custom
    loader classes to try in turn. The first one to return data wins.
  - The configuration settings :setting:`SUPPORTED_FORMATS` and
    :setting:`NETDEVICES_FORMAT`  have been deprecated.
  - The configuration setting :setting:`NETDEVICES_SOURCE` has
    replaced :setting:`NETDEVICES_FILE`.
  - The sample ``settings.py`` (found at ``conf/trigger_settings.py``
    in the source distribution) is illustrates how one may use
    :setting:`NETDEVICES_SOURCE` and :setting:`NETDEVICES_LOADERS` to
    replace the deprecated settings :setting:`NETDEVICES_FORMAT` and
    :setting:`NETDEVICES_FILE`.

+ The following changes have been made within `~trigger.twister`,
  which provides Trigger's remote execution functionality:

  - :feature:`22` Add Aruba wireless controller and Brocade ADX/VDX
    support for execute/pty in trigger.twister and any device that
    requires pty-req and shell without actualling using a pty. The
    channel class for this functionality is called
    `~trigger.twister.TriggerSSHAsyncPtyChannel` - Added a new
    ``requires_async_pty`` attribute to
    `~trigger.netdevices.NetDevice` objects to help identify devices
    that require such channels.
  - Added a ``force_cli`` flag to `~trigger.twister.execute()` to
    force CLI execution on Juniper devices instead of Junoscript.
  - The default client factory
    (`~trigger.twister.TriggerClientFactory`) now calls
    `~trigger.tacacsrc.validate_credentials()` instead of directly
    instantiating `~tacacsrc.Tacacsrc` anytime credentials are
    populated automatically, resulting in only a single call to
    `~tacacsrc.Tacacsrc()`, when creds aren't provided.
  - Added error-detection for Brocade MLX.

+ The following changes have been made within `~trigger.cmds`, which
  provides an extensible, developer-friendly interface to writing
  command exeuction adapters.

  - Added a ``force_cli`` flag to `~trigger.cmds.Commando` constructor
    to force CLI execution on Juniper devices instead of Junoscript.
  - The ``timeout`` value may now be  to be set as a class variable in
    `~trigger.cmds.Commando` subclasses.
  - `~trigger.cmds.Commando` now step through ``commands`` as
    iterables instead of assuming they are lists. The iterable is also
    now explicitly cast to a list when we need them it be one.
  - A minor bugfix in ~trigger.cmds.Commando` causing results from
    multiple Commando instances to collide with each other because
    they were inheriting an empty results ``{}`` from the class
    object.
  - `~trigger.cmds.Commando` now accepts ``creds`` as an optional
    argument. If not set, it will default to reading user credentials
    from ``.tacacsrc``.

+ The following changes have been madw within `~trigger.acl.parser`,
  which provides Trigger's support for parsing network access control
  lists (ACLs) and firewall policies.

  - :feature:`12` Support has been added for parsing IPv6 addresses in
    Juniper firewall filters.
  - :bug:`26` Parsing of "{ip} except;" in Junos ACLs doesn't seem to
    be functioning. Parser modifications to support negation of
    address in Junos ACLs.
  - Always display the prefix on /32 and /128 IPs in Juniper ACLs.

+ The following changes have been made within `~trigger.tacacsrc`,
  which provides functionality to cache and retrieve user credentials:

  - Added a new function `~trigger.tacacsrc.validate_credentials()`
    validate credentials in the form of supports 2-tuples (username,
    password), 3-tuples (username, password, realm), and dictionaries
    of the same and returns a `~trigger.tacacsrc.Credentials` object.

+ The following changes have been made to Trigger's command-line
utilities:

  - :feature:`60` ``bin/load_acl`` will now shutdown gracefully if
    initial MySQL connection doesn't work, using a try..except to
    display some information about the connection failure without a
    traceback. For other MySQL issues, we will leave as is (dumping
    the traceback) because they would represent coding or transient
    issues, and we should present as much information as we have.
  - :feature:`20` ``bin/gnng`` (get_nets) now supports not only
    support Juniper 'sp' interfaces, but we've added flags to include
    un-numbered (``-u``) or disabled (``-d``) interfaces.
Updated README.rst to reflect branching model.
Reorder the README