Update .gitignore, add in signing setup.

.gitignore

@@ -1,5 +1,34 @@
-.gradle/
-.idea/
+# built application files
+*.apk
+*.ap_
+
+# files for the dex VM
+*.dex
+
+# Java class files
+*.class
+
+# generated files
+bin/
+gen/
+out/
 build/
-local.properties
+.gradle/
+
+# Project files
 *.iml
+.idea
+# .idea/workspace.xml
+
+# Local configuration file (sdk path, etc)
+local.properties
+keystore.properties
+
+# Windows thumbnail db
+.DS_Store
+
+# Idea non-crucial project fileS
+*.iws
+
+# Sandbox stuff
+_sandbox

build.gradle

@@ -10,11 +10,28 @@ android {
         targetSdkVersion 21
     }
 
+    signingConfigs {
+        release {
+            def Properties localProps = new Properties()
+            localProps.load(new FileInputStream(file('local.properties')))
+            def Properties keyProps = new Properties()
+            if (localProps['keystore.props.file'] != null) {
+                keyProps.load(new FileInputStream(file(localProps['keystore.props.file'])))
+            }
+            storeFile keyProps["store"] != null ? file(keyProps["store"]) : null
+            keyAlias keyProps["alias"]
+            storePassword keyProps["storePass"]
+            keyPassword keyProps["pass"]
+        }
+    }
+
     buildTypes {
         release {
+            shrinkResources true
             zipAlignEnabled true
             minifyEnabled true
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
+            signingConfig signingConfigs.release
         }
     }
 }

keystore.properties.example

@@ -0,0 +1,5 @@
+# This is an example keystore.properties file.
+store=/path/to/your.keystore
+alias=your_alias
+pass=your_password
+storePass=your_keystore_password

local.properties.example

@@ -0,0 +1,3 @@
+# This is an example local.properties file.
+sdk.dir=/path/to/android/sdk
+keystore.props.file=../keystore.properties