Add comment regarding change tracker continuous mode
Fixes issue 247 for remote requests.

Changes feed fix still pending.

https://github.com/couchbase/couchbase-lite-android/issues/247
Fixes issue 247 for changes feed.

https://github.com/couchbase/couchbase-lite-android/issues/247
Issue #247 - enhance code to cover recoverable IOExceptions

https://github.com/couchbase/couchbase-lite-android/issues/247
Merge pull request #143 from couchbase/issue_247

Issue 247