upgrade to Sencha Touch 2.1 and Sencha Cmd 3.0

upgrade_ST21

Watch out if you have an existing build.xml in your project. Make sure you use the Sencha version.

Copying OpenLayers.js was possible before with adding the following in app.json:

```
     "resources": [
        "externals/openlayers/build/OpenLayers.js",
```

This does not work anymore, error is:

```
[ERR]		BUILD FAILED
[ERR]		com.sencha.exceptions.BasicException: The following error occurred while executing this line:
[ERR]		/Users/bartvde/opengeo/git/As-Built-Viewer/mobile/.sencha/app/build-impl.xml:120: javax.script.ScriptException: sun.org.mozilla.javascript.internal.WrappedException: Wrapped com.sencha.exceptions.BasicException: Cannot find file : /Users/bartvde/opengeo/git/As-Built-Viewer/mobile/build/AsBuilt/production/externals/openlayers/build/OpenLayers.js (No such file or directory) (<Unknown source>#195) in <Unknown source> at line number 195
```

So instead add a copy action to build.xml:

```
    <target name="-before-build">
        <copy file="externals/openlayers/build/OpenLayers.js" todir="build/AsBuilt/production/externals/openlayers/build"/>
    </target>
```

Still need to figure out if there is a variable to get the build path instead of hard-coding what I did here.

If you get something like:

```
[ERR]		def was null
[ERR]		failed to find meta class definition for name proxy.gxm_protocol
[ERR]		BUILD FAILED
```

it means the external library GXM was not found. The paths are not taken from app.js anymore, but instead you need to add them to .sencha/app/sencha.cfg :

```
app.classpath=${app.dir}/app.js,${app.dir}/app,${app.dir}/externals/GXM/lib/GXM
```

Also, I got a run-time error in the production build, when using a Config singleton as written up here by Mitchell: http://mitchellsimoens.com/2012/06/sencha-touch-2/build-configs-using-sencha-command/ the dependencies were not met, so I had to remove the Ext.require statement in app.js and include it in the requires section of every class that uses the Config singleton.

Hey man, I am getting the same error in sencha touch2, in Config singleton , (your last line).

I use the config variables in all "models", and I try to use you advice to include "requires" not to app.js but all models classes, but seems it did not helped, I still have that issue. There is something else to change ?

Thanks !!