Merge pull request #1573 from am11/master

srv-tslint: Fixes for tslint (npm) v0.4.13
Updated version number and VS dependency version
CSS: Added missing media query Intellisense
HTML: Update WebMarkupMin to version 0.9.7
Update WESettings.cs
Merge pull request #1577 from Taritsyn/master

HTML: Update WebMarkupMin to version 0.9.7
Adding null checks