merlin.cfg: Fix typos.

Signed-off-by: Martin Stone <martin@d7415.co.uk>
README.md: Update IMAPPush description.

Signed-off-by: Martin Stone <martin@d7415.co.uk>
README: Added links to See Also.

Signed-off-by: Martin Stone <martin@d7415.co.uk>
README: Added additional reference to See Also section at the top of the document.

Signed-off-by: Martin Stone <martin@d7415.co.uk>