Uses common gitignore file

Author: Xavi Rigau

.gitignore

@@ -1,11 +1,38 @@
+# built application files
+*.apk
+*.ap_
+
+# files for the dex VM
+*.dex
+
+# Java class files
+*.class
+
+# generated files
+bin/
+gen/
+out/
+build.log
+build-log.xml
+
+# Local configuration file (sdk path, etc)
+local.properties
+
+.project
+.classpath
 .settings
+target/
 build/
-.gradle
-/buildSrc/local.properties
-/local.properties
-/.idea
-*/build
-/classes
-.DS_Store
+classes/
+gen-external-apklibs/
+tmp/
+
+# IDEA Ignores
 *.iml
+*.ipr
+*.iws
+.idea/
+.gradle/
 
+# MAC
+*.DS_Store