2013-08-23: Added tag 0.4 for changeset c3d791b75bce releases

Added tag 0.4 for changeset c3d791b75bce

diff --git a/.hgtags b/.hgtags
--- a/.hgtags
+++ b/.hgtags
@@ -7,3 +7,4 @@ 1226b572fe8531d08ce7c46a67acbd50d03c6fed
 60a06053d8cdba12a6cfc0753dc5dab36b57590f 0.2.1
 0d5bd543ab137064aab252d5fe627a676b434e98 0.2.2
 ba0e1fba077fa2172a0b0a2c2841a3f3fd70d071 0.3
+c3d791b75bce0e424b68ccfceeaa1cc97aba0808 0.4