Adding submit module to docs

docs/submit.rst

+.. _Staging:
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+JDL Submission Modules
+=============
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+This module is located in GRID_LRT.Application. It can create and submit a jdl file, linking it with a CouchDB design document (i.e. token 'type')
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+.. _submit-doc:
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+GRID_LRT.Application.submit
+--------------------                                                                                     
+.. automodule:: GRID_LRT.Staging.submit
+    :members:
+    :undoc-members:
+    :inherited-members:
+    :show-inheritance:
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