[ci skip] Update Napa.js to version 0.1.5 (microsoft#117)

[ci skip] Update Napa.js to version 0.1.4 (microsoft#86)

[ci skip] Update Napa.js to version 0.1.3 (microsoft#63)

[ci skip] Update Napa.js to version 0.1.2 (microsoft#59)

[ci skip] Update Napa.js to version 0.1.1 (microsoft#49)

API tuning: two minor changes for usability. (microsoft#29)

1. Make broadcast/execute args optional.
2. Introduce 'global.napa' to access napajs module.