Use GrabVer versioning

Signed-off-by: Mario Danic <mario@lovelyhq.com>

app/build.gradle

@@ -1,4 +1,14 @@
 apply plugin: 'com.android.application'
+apply plugin: 'eu.davidea.grabver'
+
+versioning {
+    major 0
+    minor 1
+    //preRelease "rc1"
+}
+
+// For maven repository
+version = versioning.name
 
 android {
     compileSdkVersion 26

build.gradle

@@ -5,9 +5,11 @@ buildscript {
     repositories {
         google()
         jcenter()
+        maven { url "http://dl.bintray.com/davideas/maven" }
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.0.0-rc1'
+        classpath 'com.android.tools.build:gradle:3.0.0-rc2'
+        classpath 'eu.davidea:grabver:0.6.0'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files