File i/o broken on android

[kynora]

This pull request relate to #242.

• Add ability to read and write to app internal dir and cache dir in Android, getUserDataDirectory() and getUserHomeDirectory() are point to inernal storage.

[greenfire27]

It looks great, but I think you need to isolate your commit for this request better. Use the instructions found here to create a new branch that matches the dev branch in every way except for your commit. Then create a new pull request.