Support for fontWeight in fontStyle and activeFontStyle

[remstos]

Would be great to support fontWeight property in addition to the fontFamily and fontSize

Thanks!

[abifdhllh]

I've submitted a PR to solve this #133

[nadejdashed]

Please correct index.ts file to support fontWeight.
Also ios stays with fontWeight:bold for active tab all the time.

[MSchmidt]

The merged PR doesn't seem to take care of iOS. So this is only working in the JS implementation, right?