Add ScrollView to LoginActivity, fix #146

app/src/main/res/layout/activity_login.xml

 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <LinearLayout
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:focusable="true"
         android:focusableInTouchMode="true"
-    android:orientation="vertical"
-    android:weightSum="2">
+        android:orientation="vertical">
 
 
         <LinearLayout
             android:layout_width="match_parent"
-        android:layout_height="match_parent"
-        android:layout_weight="1"
+            android:layout_height="wrap_content"
             android:orientation="vertical">
 
             <ImageView
                 android:layout_width="match_parent"
-            android:layout_height="199dp"
-            android:layout_marginBottom="15dp"
+                android:layout_height="200dp"
+                android:layout_marginBottom="20dp"
                 android:contentDescription="InstiApp"
                 android:paddingLeft="100dp"
                 android:paddingRight="100dp"
@@ -35,8 +37,8 @@
 
         <LinearLayout
             android:layout_width="match_parent"
-        android:layout_height="match_parent"
-        android:layout_weight="1"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="100dp"
             android:orientation="vertical"
             android:padding="20dp">
 
@@ -50,7 +52,6 @@
                     android:id="@+id/login_username"
                     android:layout_width="match_parent"
                     android:layout_height="wrap_content"
-                android:ems="10"
                     android:hint="LDAP ID"
                     android:inputType="text" />
             </android.support.design.widget.TextInputLayout>
@@ -66,7 +67,6 @@
                     android:id="@+id/login_password"
                     android:layout_width="match_parent"
                     android:layout_height="wrap_content"
-                android:ems="10"
                     android:hint="Password"
                     android:inputType="textPassword" />
             </android.support.design.widget.TextInputLayout>
@@ -96,4 +96,5 @@
                 android:textAppearance="@style/TextAppearance.AppCompat.Light.SearchResult.Subtitle" />
         </LinearLayout>
 
-</LinearLayout>
+    </LinearLayout>
\ No newline at end of file
+</ScrollView>
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