Improve support for Andrioid M

Checks for and requests runtime location permissions (fixes #2110)
Improved the styling of the location FAB
Removed redudant drawables
Fixed various Java and Android warnings and deprecated functions
A few other tweaks

android/java/MapboxGLAndroidSDKTestApp/src/main/res/layout/activity_main.xml

@@ -47,13 +47,13 @@
 
                 <android.support.design.widget.FloatingActionButton
                     android:id="@+id/locationFAB"
-                    android:src="@drawable/ic_my_location_white_24dp"
+                    android:src="@drawable/ic_my_location_black_24dp"
                     android:layout_width="wrap_content"
                     android:layout_height="wrap_content"
                     android:layout_gravity="end|bottom"
                     android:layout_margin="@dimen/fab_margin"
+                    app:backgroundTint="@color/white"
                     app:borderWidth="0dp"
-                    app:elevation="0dp"
                     />
                 </android.support.design.widget.CoordinatorLayout>
 

android/java/MapboxGLAndroidSDKTestApp/src/main/res/menu/menu_drawer.xml

@@ -3,7 +3,7 @@
 
     <item
         android:id="@+id/action_debug"
-        android:icon="@drawable/ic_action_about"
+        android:icon="@android:drawable/ic_menu_info_details"
         android:title="@string/action_debug"
         android:checkable="true"
         />
@@ -14,7 +14,7 @@
         android:checkable="true"
         />
     <item android:id="@+id/action_compass"
-          android:icon="@drawable/ic_explore_white_24dp"
+          android:icon="@android:drawable/ic_menu_compass"
           android:title="@string/action_compass"
           android:checkable="true"
           />

android/java/MapboxGLAndroidSDKTestApp/src/main/res/values/strings.xml

@@ -4,10 +4,10 @@
     <string name="app_name">Mapbox GL</string>
 
     <string name="action_gps">Toggle GPS location</string>
-    <string name="action_location_none">Toggle Location Bearing Tracking</string>
-    <string name="action_location_follow">Follow</string>
-    <string name="action_location_bearing">Bearing</string>
-    <string name="action_compass">Toggle Compass</string>
+    <string name="action_location_none">Disable tracking</string>
+    <string name="action_location_follow">Use follow tracking mode</string>
+    <string name="action_location_bearing">Use bearing tracking mode tracking</string>
+    <string name="action_compass">Toggle compass</string>
     <string name="action_debug">Toggle debug mode</string>
     <string name="action_point_annotations">Toggle point annotations</string>
 

android/java/MapboxGLAndroidSDKTestApp/src/main/res/values/styles.xml

@@ -7,7 +7,6 @@
         <item name="colorPrimary">@color/primary</item>
         <item name="colorPrimaryDark">@color/primaryDark</item>
         <item name="colorAccent">@color/accent</item>
-        <item name="android:windowBackground">@color/white</item>
     </style>
 
 </resources>