Remove uses-sdk from AndroidManifest.xml (#664)

* Remove uses-sdk from AndroidManifest.xml

    since uses-sdk values are now superseded by Gradle files

* remove elementtree no longer needed

* remove internal capitalize function no longer needed

* remove AndroidManifest SDK version tests no longer needed

resolves #629

package.json

@@ -31,7 +31,6 @@
   "dependencies": {
     "android-versions": "^1.3.0",
     "cordova-common": "^3.1.0",
-    "elementtree": "^0.1.7",
     "nopt": "^4.0.1",
     "properties-parser": "^0.3.1",
     "q": "^1.4.1",