Add entries to .gitignore for m2e settings/preference files

Change-Id: Ie70c285440b6200ad7f4dd8dea8a97317e1e62fc
diff --git a/.gitignore b/.gitignore
index 0476c1d..f318b65 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 /.classpath
 /.project
+/.settings
 /.settings/org.eclipse.jdt.core.prefs
 /.settings/org.maven.ide.eclipse.prefs
 /test_site