renamed the undefined plugins variable to selector_plugins
Fixing confusing description

```false``` is the default for the create option yet the description says ```true``` is the default behavior, so I'm removing that from the description.
Merge pull request #492 from ianwalter/patch-1

Fixing confusing description
Merge pull request #472 from mudassir0909/issue/grunt_build

renamed the undefined plugins variable to selector_plugins
Fixed broken bootstrap3 build.