Installer updated for localized resources

Background
-----
This pull request updates the installer (both `MSI` and `EXE` installers) to deal with localized resources (both `*.resources.dll` and `*.xml`) under the following folders:

```
{app}\en-US
{app}\nodes\en-US
{app}\Revit_2014\en-US
{app}\Revit_2014\nodes\en-US
{app}\Revit_2015\en-US
{app}\Revit_2015\nodes\en-US
```

In addition to `*.resources.dll` and `*.xml`, the following files are also copied under `{app}\en-US` folder.