Issue #182: Update config.xml android-minSdkVersion

We shouldn't be setting a min SDK version here. It will cause compilation problems with cordova-android.

www/config.xml

@@ -36,7 +36,6 @@
     <preference name="show-splash-screen-spinner" value="true" />           <!-- ios: if set to false, the spinner won't appear on the splash screen during app loading -->
     <preference name="auto-hide-splash-screen"    value="true" />           <!-- ios: if set to false, the splash screen must be hidden using a JavaScript API -->
     <preference name="disable-cursor"             value="false" />          <!-- blackberry: prevents a mouse-icon/cursor from being displayed on the app -->
-    <preference name="android-minSdkVersion"      value="7" />              <!-- android: MIN SDK version supported on the target device. MAX version is blank by default. -->
     <preference name="android-installLocation"    value="auto" />           <!-- android: app install location. 'auto' will choose. 'internalOnly' is device memory. 'preferExternal' is SDCard. -->
     <!--
         Define a specific version of PhoneGap to build into your app.