Fixes: U4-5380 Booting.aspx security issue
#U4-5379 Fixed Due in version: 7.1.6

Some users have not set an email, don't strip out empty entries
#U4-5385 fixed Due in version: 7.1.6
#U4-4673 Fixed Due in version: 7.1.6
Fixes: U4-5388 YSOD after doctype rename & U4-5387 Deleting Properties in document types causes "Object reference not set to an instance of an object"
Fixes: U4-5384 Custom ApiController routes not working after upgrade to 7.1.5
Bump version number
Fixes duplicate key error (U4-5385)
Merge branch '7.1.6' into 7.2.0

Conflicts:
	build/UmbracoVersion.txt
	src/Umbraco.Core/Configuration/UmbracoVersion.cs
	src/Umbraco.Web.UI/Umbraco.Web.UI.csproj
ensure normal browser cache is busted for auth upgrade view
Update .gitignore for output files generated by ng-docs
Add new Grunt Task 'docserve' to rerun ng-docs task & spin up a test server to browse to along with new watch task to recompile generated docs
Initial starting work on ng-doc fleshing out for auth.resource.js (Also to see if Core team happy with this before investing too much time)
Add style attribute to the headline white-listed attributes
Merge pull request #463 from kgiszewski/feature/rte-config

Fix for U4-5409 headline justification in the RTE
Merge pull request #461 from warrenbuckley/NG-Documentation

NG Documentation improvements
Merge branch '7.2.0' into 7-content-cache
Move XPathStrings to their own class
PublishedCaches - refactoring
NoCache - refactor PublishedCaches