External Chunking Bugfix

This commit fixes an issue that occurs on changes following when the CouchDB server is behind a proxy. A proxy may or may not produce smaller chunks than the original implementation which produces one full chunk per change. A buffer has been introduced to mitigate the problem.

Updated README

Added ICouch.Document.revisions/1

Implemented Collectable for ICouch.Document; added attachments suppor…

…t to ICouch.Document.put/2

Also improved code style sligtly by removing parentheses from fn's.

Fixed semantic issue in ChangesFollower

A test has been added to verify the correct behavior.

Added equality test functions for documents

* ICouch.Document.equal?/2
* ICouch.Document.equal_content?/2
* ICouch.Document.equal_attachments?/2

Fixed SSL for ChangesFollower

Added changes follower test

This helped to unveil a hard-to-spot mistake. Hooray for unit tests!

Improved option handling; fixed changes follower options

Small fix for parameter parsing