[ALOY-1140] Windows: The path format for app.js is different from controller files in sourcemap

The sourcemap contains different source location path format for app.js file compared to controller files on Windows platform. The map file for app.js is :

"version":3,"file":"Resources/android/app.js","sources":["Resources/android/app.js"]

The map file for index.js is :

"version":3,"file":"Resources\\alloy\\controllers\\index.js","sources":["Resources\\alloy\\controllers\\index.js","app\\controllers\\index.js"]

Due to the difference of path formats, Studio fails to parse the paths and the debugger fails to stop at the expected breakpoints. We need to investigate the difference in the path generation and ideally, in order to handle the paths consistently across all platforms, it might be better to have the paths in unix format.