Improve Gradle Build Arguments (#699)

* Remove `uses-sdk` from AndroidManifest
* Remove dependency `elementtree`
* Updated Build Command Help Menu Printout
  * Cleanup `minSdkVersion` printout
  * Added  `maxSdkVersion`, but not recommended to set.
  * Added `targetSdkVersion`
* Update the `GradlePropertiesParser` & Test Spec
  * Always Set Overriding Changes
  * Update existing properties
  * Update configure method

framework/AndroidManifest.xml

@@ -19,5 +19,4 @@
 -->
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
       package="org.apache.cordova" android:versionName="1.0" android:versionCode="1">
-    <uses-sdk android:minSdkVersion="19" />
 </manifest>

framework/build.gradle

@@ -53,6 +53,11 @@ android {
         targetCompatibility JavaVersion.VERSION_1_8
     }
 
+    // For the Android Cordova Lib, we will hardcode the minSdkVersion and not allow changes.
+    defaultConfig {
+        minSdkVersion 19
+    }
+
     sourceSets {
         main {
             manifest.srcFile 'AndroidManifest.xml'