add bwmysqlpoller.
fix gitignore about nuget rebuild.
Merge branch 'master' of https://github.com/opserver/Opserver
start update linux.
fix cpu , mem warning bug.
Merge branch 'master' of https://github.com/opserver/Opserver
fix linux poller, and dashboard overallstatus.
Merge branch 'master' of https://github.com/opserver/Opserver

Conflicts:
	Opserver.Core/packages.config
	Opserver/packages.config
fix conn
Merge branch 'master' of https://github.com/laneser/Opserver

Conflicts:
	Opserver.Core/packages.config
	Opserver/Controllers/LoginController.cs
	Opserver/Views/Dashboard/Dashboard.Table.cshtml
	Opserver/Web.config
	Opserver/packages.config