Move contributing guide to root of repository

CONTRIBUTING.md

@@ -1,4 +1,4 @@
-# Contribute
+# Contributing
 
 Mozilla Foundation currently (as of 2016) uses Mattermost as our communications solution. If at any point you need help, have a question or just want to say hello; join our [chat room](https://chat.mozillafoundation.org).
 
@@ -21,7 +21,7 @@ Mozilla Foundation currently (as of 2016) uses Mattermost as our communications
 
   * After it has installed successfully, you should see the following screen:
 
-  ![android studio menu](img/android-studio-menu.png)
+  ![android studio menu](docs/img/android-studio-menu.png)
 ## USB Debugging
 
   * In order to start testing apps on your physical Android device, we need to first activate developer mode by tapping ```Settings > About > Build Number``` seven times
@@ -42,7 +42,7 @@ Mozilla Foundation currently (as of 2016) uses Mattermost as our communications
 
   * Connect your device via USB, and press the "run" button:
 
-![run button](img/android-run-btn.png)
+![run button](docs/img/android-run-btn.png)
 
 ## Review MoFo Engineering Standards
 

build.gradle

@@ -5,7 +5,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.2.3'
+        classpath 'com.android.tools.build:gradle:2.3.0'
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
     }

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Mon Dec 28 10:00:20 PST 2015
+#Mon Mar 06 20:52:00 EST 2017
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.14.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-3.3-all.zip