Fixed modernizr dependency
Fixed modernizr dependency

Summary:
Updated grunt file,
Speeded up the build process in general,
building require js does not result in copying the entire project directory

Test Plan: generate project, run grunt build, http-server dist, run site

Reviewers: dominika.hurajtova, #aowp-ba

Reviewed By: dominika.hurajtova, #aowp-ba

Subscribers: dominika.hurajtova

JIRA Issues: larc-674

Differential Revision: http://23.23.125.207/D699

mmacai/generator-mario,Accenture/generator-mario,mmacai/generator-mario,Accenture/generator-mario