Bump gulp-wrap from 0.14.0 to 0.15.0 in /js

Bumps [gulp-wrap](https://github.com/adamayres/gulp-wrap) from 0.14.0 to 0.15.0.
- [Release notes](https://github.com/adamayres/gulp-wrap/releases)
- [Changelog](https://github.com/adamayres/gulp-wrap/blob/master/CHANGELOG.md)
- [Commits](https://github.com/adamayres/gulp-wrap/commits

)

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