[Technical] Duplicate module for grunt tab openning

[GMartigny]

This is more of an info than an issue, but the module grunt-open is not usefull here.

Since the v0.5.0, grunt-contrib-connect provides an option to open the served URL into the default browser.
Triming a module and its dependencies can avoid bugs and overheads.

I can provide the PR if this is approuved.

Cheers

[juliandescottes]

@GMartigny thanks for the heads up! Feel free to PR if that works :)