CouchDbChangesTemplate now allows to specify the initial local sequence number
BasicAuthRestTemplate uses a multi-threaded connection manager

I currently have no time to add correct configuration options to be
passed through, so I hard-coded 50 connections per host (and 50
connections max).

Promise to clean up this hack.
Merge branch 'master' into release-branch
Bump version to 0.1.kd4 for release.

Tests with and without authentication are green.
Updated to Spring Integration 4.x and Apache HttpComponents 4