Merge pull request #306 from robertwb/master

Clarify license position with respect to compilation output.

COPYING.txt

@@ -10,3 +10,10 @@ made to go from Pyrex to Cython are so licensed.
 
 See LICENSE.txt for more details.
 
+------------------
+
+The output of a Cython compilation is NOT considered a derivative
+work of Cython.  Specifically, though the compilation process may
+embed snippets of varying lengths into the final output, these
+snippets, as embedded in the output, do not encumber the resulting
+output with any license restrictions.