Add test coverage for

• Client registration
• Client authorization
• Token endpoint

Our markdown library wraps the text in a div, that div breaks out of the <p> scope (as we are working with HTML, not XHTML) and then we get an orphaned </p> tag.

​http://validator.w3.org/check?uri=http%3A%2F%2Fgobblin.se%2Fu%2Fjoar%2F&charset=%28detect+automatically%29&doctype=Inline&group=0&user-agent=W3C_Validator%2F1.3

Until ​bug 736260 in pygobject/pbutils has been fixed, we get these warnings whenever mediagoblin is run:

…/lib64/python2.7/site-packages/gi/module.py:178: Warning: g_array_append_vals: assertion 'array' failed
  g_type = info.get_g_type()
…/lib64/python2.7/site-packages/gi/module.py:178: Warning: g_hash_table_lookup: assertion 'hash_table != NULL' failed
  g_type = info.get_g_type()
…/lib64/python2.7/site-packages/gi/module.py:178: Warning: g_hash_table_insert_internal: assertion 'hash_table != NULL' failed
  g_type = info.get_g_type()

Attached is a patch to workaround it - run Gst.init() before the import.