Fixing default variable.

s/USER/USERNAME/ . Bug introduced after fix #958 (herp derp).
Use bower when building debian package.

From::
Running "uglify:generated" (uglify) task
File tmp/loader.js created: 0 B → 0 B
File tmp/scripts.js created: 325.38 kB → 232.55 kB
To::
Running "uglify:generated" (uglify) task
File tmp/loader.js created: 3.32 kB → 3.19 kB
File tmp/scripts.js created: 2.22 MB → 800.16 kB