updated the `grunt-contrib-uglify` plugin to last 0.2.7 version
Revert "updated the `grunt-contrib-uglify` plugin to last 0.2.7 version"

This reverts commit 0eb010c31503fa57654e8c90e820f0be051d654a.
updated the `grunt-contrib-uglify` plugin to last 0.2.7 version
Merge remote-tracking branch 'origin/1.0.0-dev' into ticket-103-clean