Add a flag (default false) to switch building of the Lwt subpackage

Signed-off-by: John Else <john.else@citrix.com>
Compile with --flag lwt if Lwt is installed

Signed-off-by: John Else <john.else@citrix.com>
Bump version to 0.1.1

Signed-off-by: John Else <john.else@citrix.com>
Add ChangeLog

Signed-off-by: John Else <john.else@citrix.com>