Implement the mechanics of fxa login on android, but don't show ui fo… (#1000)

* Implement the mechanics of fxa login on android, but don't show ui for it yet. Also, scopedKeys are not yet implemented.

* Hopefully fix the package-lock conflict?

* WIP on android scoped keys

* Finish implementing login.

* created android/user.js to handle android logins

android/build.gradle

@@ -2,12 +2,13 @@
 
 buildscript {
     ext.kotlin_version = '1.2.60'
+    ext.android_components_version = '0.26.0'
     repositories {
         google()
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.1.4'
+        classpath 'com.android.tools.build:gradle:3.2.1'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.2.60"
 
         // NOTE: Do not place your application dependencies here; they belong
@@ -18,6 +19,9 @@ buildscript {
 allprojects {
     repositories {
         google()
+        maven {
+            url "https://maven.mozilla.org/maven2"
+        }
         jcenter()
         maven { url "https://jitpack.io" }
     }