Clean build.gradle files

  * clean main build.gradle
  * update appcompat-v7 and design support libraries to the 24.2.1 version

Author: radzio

app/build.gradle

@@ -35,8 +35,8 @@ dependencies {
     androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
         exclude group: 'com.android.support', module: 'support-annotations'
     })
-    compile 'com.android.support:appcompat-v7:24.2.0'
-    compile 'com.android.support:design:24.2.0'
+    compile 'com.android.support:appcompat-v7:24.2.1'
+    compile 'com.android.support:design:24.2.1'
     compile 'com.android.support.constraint:constraint-layout:1.0.0-alpha7'
     compile 'com.android.support.constraint:constraint-layout-solver:1.0.0-alpha7'
     compile "io.reactivex:rxjava:1.1.10"

build.gradle

@@ -1,14 +1,10 @@
-// Top-level build file where you can add configuration options common to all sub-projects/modules.
-
 buildscript {
     repositories {
         jcenter()
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:2.2.1'
         classpath 'me.tatarka:gradle-retrolambda:3.3.0-beta4'
-        // NOTE: Do not place your application dependencies here; they belong
-        // in the individual module build.gradle files
     }
 }