Update Send to Google Docs code to use an activity

to show progress bar and an AysncTask to send
to Google Docs.

Future plan:
Plan to place common code across SendDocs, SendFusionTables,
and SendMaps in abstract classes.

MyTracksApiSample/res/layout/main.xml

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_height="match_parent"
+    android:layout_width="match_parent"
+    android:orientation="vertical"
+    >
+  <Button android:id="@+id/start_recording_button"
+    android:layout_height="wrap_content"
+    android:layout_width="wrap_content"
+    android:text="@string/start_recording"
+    />
+  <Button android:id="@+id/stop_recording_button"
+    android:layout_height="wrap_content"
+    android:layout_width="wrap_content"
+    android:text="@string/stop_recording"
+    />
+  <Button android:id="@+id/add_waypoints_button"
+    android:layout_height="wrap_content"
+    android:layout_width="wrap_content"
+    android:text="@string/add_waypoints"
+    />
+  <TextView android:id="@+id/output"  
+    android:layout_height="wrap_content" 
+    android:layout_width="match_parent"
+    />
+</LinearLayout>

MyTracksApiSample/res/values/strings.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="add_waypoints">Add a waypoint to all the tracks</string>
+    <string name="app_name">MyTracksApiSample</string>
+    <string name="start_recording">Start recording</string>
+    <string name="stop_recording">Stop recording</string>
+</resources>