Fix .gitignore to account for extensions.
diff --git a/.gitignore b/.gitignore
index 772dff5..f4ceeb7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,6 @@
-/build/
+build/
 target/
-/bin/
+bin/
 .project
 .classpath
 .settings/