Fix ImportError when __main__ already loaded #616
Merged
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In rdflib/init - place import of main into a try catch block to catch ImportError that you get when already imported such as in a Google App Engine instance running webapp2.
Enables the use of rdflib unchanged in this configuration of Google App Engine and potentially other environments that claim main before rdflib gets loaded.
This has been tested as functional in the latest version of the Schema.org code base.