Update gulp-ruby-sass to 0.7.1

Necessary for updated styles task.
Reduce to a single S/CSS task and watcher

- Outputs all Sass / CSS to .tmp
- Only compiles Sass files in the folder root Sass directory and those named
  specifically. In order for `changed` to work, users should only add files that
  have output files to their styles task, and let gulp-ruby-sass figure out the
  dependencies.w
Adding material design color palette variables to sass
Adding output css file
Merge pull request #314 from robwierzbowski/rw/single-sass-task

Bump gulp-ruby-sass to 0.7.1, reduce to single Sass task
bump deps
update to new useref API
minify images
Fixes #286 - fix navigation flash during resize.
remove deprecated .jshintrc props - fixes #329
Merge branch 'master' of https://github.com/google/web-starter-kit into mdcolors
Merge pull request #317 from devnook/mdcolors

Adding material design color palette variables to sass
Fetch the `.htaccess` file via `npm`
Merge pull request #333 from alrra/fetch-htaccess-via-npm

Fetch the `.htaccess` file via `npm`
fix #340
Merge pull request #342 from markuz-gj/master

Fixes #340 - overoptimistic UnCSS removal.
add spacing to css declaration
remove repeated declaration block and unnecessary overridden css
Merge pull request #345 from joaostein/fixSpacing

add spacing to css declaration
Merge pull request #346 from joaostein/fixNavdrawerContainerCSS

remove repeated declaration block and unnecessary overridden css