Inject some metadata in oml4r-simple-example.rb

refs: #1612
Signed-off-by: Olivier Mehani <olivier.mehani@nicta.com.au>
Initialise @@appName in MPBase

XXX This variable is randomly sprinkled in various scopes...

Signed-off-by: Olivier Mehani <olivier.mehani@nicta.com.au>
Do not initialise all schema numbers to 0

fixes: #1612
Signed-off-by: Olivier Mehani <olivier.mehani@nicta.com.au>