Merge pull request cloudant#336 from cloudant/prepare-2.7.0-release

Prepare for 2.7.0 release

2.6.0 (2017-08-10)

- [NEW] Added ``Cloudant.bluemix()`` class method to the Cloudant client allowing service credentials to be passed using the CloudFoundry VCAP_SERVICES environment variable.
- [FIXED] Fixed client construction in ``cloudant_bluemix`` context manager.
- [FIXED] Fixed validation for feed options to accept zero as a valid value.

2.5.0 (2017-07-06)

[FIXED] Fixed crash caused by non-UTF8 chars in design documents.
[FIXED] Fixed TypeError when setting revision limits on Python>=3.6.
[FIXED] Fixed the exists() double check on client.py and database.py.
[FIXED] Fixed Cloudant exception code 409 with 412 when creating a database that already exists.
[FIXED] Catch error if throw_on_exists flag is False for creating a document.
[FIXED] Fixed /_all_docs call where keys is an empty list.
[FIXED] Issue where docs with IDs that sorted lower than 0 were not returned when iterating through _all_docs.

2.4.0 (2017-02-14)

==================
- [NEW] Added ``timeout`` option to the client constructor for setting a timeout on a HTTP connection or a response.
- [NEW] Added ``cloudant_bluemix`` method to the Cloudant client allowing service credentials to be passed using the CloudFoundry VCAP_SERVICES environment variable.
- [IMPROVED] Updated non-response related errors with additional status code and improved error message for easier debugging.
  All non-response error are handled using either CloudantException or CloudantArgumentError.
- [FIXED] Support ``long`` type argument when executing in Python 2.

2.3.1 (2016-11-30)

==================
- [FIXED] Resolved issue where generated UUIDs for replication documents would not be converted to strings.
- [FIXED] Resolved issue where CouchDatabase.infinite_changes() method can cause a stack overflow.

2.3.0 (2016-11-02)

==================
- [FIXED] Resolved issue where the custom JSON encoder was at times not used when transforming data.
- [NEW] Added support for managing the database security document through the SecurityDocument class and CouchDatabase convenience method ``get_security_document``.
- [NEW] Added ``auto_renewal`` option to the client constructor to handle the automatic renewal of an expired session cookie auth.

2.2.0

=====
- [NEW] Added auto connect feature to the client constructor.

- [FIXED] Requests session is no longer valid after disconnect.

2.1.1

=====
- [FIXED] HTTPError is now raised when 4xx or 5xx codes are encountered.

2.1.0

=====
- [NEW] Added support for Cloudant Search execution.
- [NEW] Added support for Cloudant Search index management.
- [NEW] Added support for managing and querying list functions.
- [NEW] Added support for managing and querying show functions.
- [NEW] Added support for querying update handlers.
- [NEW] Added ``rewrites`` accessor property for URL rewriting.
- [NEW] Added ``st_indexes`` accessor property for Cloudant Geospatial indexes.
- [NEW] Added support for DesignDocument ``_info`` and ``_search_info`` endpoints.
- [NEW] Added ``validate_doc_update`` accessor property for update validators.
- [NEW] Added support for a custom ``requests.HTTPAdapter`` to be configured using an optional ``adapter`` arg e.g.
  ``Cloudant(USERNAME, PASSWORD, account=ACCOUNT_NAME, adapter=Replay429Adapter())``.
- [IMPROVED] Made the 429 response code backoff optional and configurable. To enable the backoff add
  an ``adapter`` arg of a ``Replay429Adapter`` with the desired number of retries and initial backoff. To replicate
  the 2.0.0 behaviour use: ``adapter=Replay429Adapter(retries=10, initialBackoff=0.25)``. If ``retries`` or
  ``initialBackoff`` are not specified they will default to 3 retries and a 0.25 s initial backoff.
- [IMPROVED] Additional error reason details appended to HTTP response message errors.
- [FIX] ``415 Client Error: Unsupported Media Type`` when using keys with ``db.all_docs``.
- [FIX] Allowed strings as well as lists for search ``group_sort`` arguments.

2.0.3

=====
- [FIX] Fixed the python-cloudant readthedocs documentation home page to resolve correctly.