Fix coveralls run on Python 2.6. Skip coveralls for Jython.

ci/run_coveralls.py

@@ -5,11 +5,15 @@ http://stackoverflow.com/a/33012308/1960601
 """
 
 import os
+import sys
 
 from subprocess import call
 
 
 if __name__ == '__main__':
+    if sys.platform.lower().startswith('java'):
+        print("Export to coveralls skipped for Jython")
+        sys.exit(0)
     if 'TRAVIS' in os.environ:
         rc = call('coveralls')
         raise SystemExit(rc)