[cutes] cutes qtcore.js became qt-core.js

This is done to avoid conflicts with previous versions of cutes-js
during upgrade

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
Merge pull request #12 from nemomobile/use-qt-core-not-qtcore

[cutes] cutes qtcore.js became qt-core.js