0.1.2: Hotfix release

This release fixes a bug in the "Convert to OpenSim Model" part of the mesh importer screen.

The bug was causing scenes containing scaled meshes to incorrectly move the meshes around during the conversion step (see #153). This was due to some bad math in the export converter (a diff is attached to the issue).

The "Uninstall failed" bug (see #131) bug is still present. If you are re-installing OpenSim Creator to update your version, just click "no" to the "uninstall previous version?" prompt. The new version will still install correctly.