Stringext -> Xstringext

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

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

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

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

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

Signed-off-by: John Else <john.else@citrix.com>
Release 0.5.1

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