Instagram-private-api

- Support specification of location to ``post_photo()``, ``post_video()``
- Proxy support (alpha)
- Support usertags in ``edit_media()`` (app client)
- New endpoint functions for app client
* ``expose()``
* ``megaphone_log()``
* ``discover_channels_home()``
* ``discover_chaining()``
* ``user_map()``
* ``feed_popular()``
* ``friendships_block()``
* ``usertag_self_remove()``
* ``edit_profile()``
* ``logout()``

- New disable/enable media comments endpoints
- New FB location search endpoint

- Add new settings property to help extract settings for saving

- Fix Python 3 compatibility

- Detect if authenticated cookie has expired and raise ClientCookieExpiredError

- Detect if re-login is required and raise ClientLoginRequiredError