Update .gitignore to ignore __pycache__/.

Update .gitignore to ignore pycache/.
b14f2a0b · Damien George · 71dcd519 · b14f2a0b
Commit b14f2a0b authored Apr 12, 2014 by Damien George
--- a/.gitignore
+++ b/.gitignore
@@ -27,3 +27,7 @@ build/
 ######################
 tests/*.exp
 tests/*.out
+
+# Python cache files
+######################
+__pycache__/