Allow a servicename other than the hard-coded "MyApp"

Created originally on Bitbucket by cmcdaniel (Craig McDaniel)

Changesets for this Pull Request have not been imported, because it had been already declined on Bitbucket. Marked as closed by the import user.

We are looking at using wsme as a replacement for tgwebservices and would like the switch to be as transparent as possible. To do that, we need the ability to set the servicename to something other than "MyApp".