Added MacOSX related file types

Signed-off-by: Thodoris Bais <thodoris.bais@gmail.com>

.gitignore

diff --git a/.gitignore b/.gitignore
index 58e2045..6f85ce9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,10 @@
 **/.classpath
 **/.project
 .settings/
+
+# IntelliJ #
+.idea/
+*.iml
+
+ # OS Files #
+.DS_Store
\ No newline at end of file