Fetch .htaccess file via npm and remove 404 page

Ref yeoman/generator-webapp#422
Close yeoman/generator-webapp#422
Merge pull request #422 from alrra/fetch-htaccess-via-npm

Fetch `.htaccess` file via `npm` and remove the `404` page
bump template deps
bump deps
grunt file - add new option for conservative whitespace collapse

fixes #414
bump to latest yeoman-generator
fix failing test