[TIMOB-2388] Android: File.toString() fails

Fails when trying to read in JSON data from a file. E.g.

var slFile = Ti.Filesystem.getFile(Ti.Filesystem.resourcesDirectory, slFilePath);
var slFileData = slFile.read();
Ti.API.info("JSON Data is: '" + slFileData.toString() + "'");
slCachedData = JSON.parse(slFileData.toString());

Where slFilePath is a valid path to a .json file with valid JSON data in it (this code works fine under iPhone with the same data). The above prints out "[INFO] [27,24101] JSON Data is: '[object TiBlob]'". Because the conversion to string does not work, I then get a JSON parse error:

[TRACE] E/KrollMethod( 450): (kroll$3) [4,24105] Exception calling kroll method parse, invocation: [callMethod JSON.parse ti.modules.titanium.json.JSONModuleBindingGen$2@451a19f0"json"=[object TiBlob]]
[TRACE] E/KrollMethod( 450): org.json.JSONException: Unterminated array at character 9 of [object TiBlob]

Makes sense as it's trying to parse that string as JSON, which it isn't.