(#524) - style=all_docs support for websql and leveldb

This is also related to #728
(#744) Update Gruntfile for newer Grunt-saucelabs version
(#740) - fix #732 websql conflicts regression
(#747) - Disable chrome tests in travis

Something has changed on saucelabs which breaks chrome, disabling
them temporarily
(#739) - remove complicated not used code from bulk_docs
(#738) - report error when no _rev

When bulk_docs with new_edits and no _rev then we have
to report error to our users. Previously Pouch just crashed
(#747) Tests failing - adding scrolling to tests on saucelabs to see the actual output
(#754) - Adding 'group' and 'group_level' support for CouchDB

Adding the possibility to add a 'group' or 'group_level' option when
querying a CouchDB, so reduced results will group correctly.

Corrected missing '+'
(#706) - fix limit implementation in api.changes

* limit action should be done after deduplication and
filter aplication
* this implementation could be much less performant as
we don't limit the result set (but how can we improve it?)
(#378) - Fixed IE delay when delete database
(#753) - Add jenkins deploy script
(#715) fixes #715 by documenting continious replication
(#761) - Web SQL not retrieving id when reopened
(#768) - Add levelDown dependancy
(#765) Pouchdb checks if view exists if not returns missing_named_view error