Updating the version of browser sync

This will enable the TLS functionality
Adds 'https:true' to both serve task

This should fully enable HTTPS server testing.
Removes https by default and provides some guidance for the developer about how to enable it
Merge pull request #290 from google/https-browserSync

Adding HTTPS source via an updated browser sync
remove duplicated line-height
Merge pull request #306 from rdorde/dup-css-prop

Remove duplicated line-height in .logo
SASS now compiles on serve
remove unnecessary empty line.
Merge pull request #313 from appleboy/patch-1

remove unnecessary empty line.
Merge pull request #310 from webmakersteve/master

Compile SASS on Gulp serve task
Merge branch 'master' of https://github.com/google/web-starter-kit into palette