added more icons for colors lab
Move pane setup under button click event;
Modified file attribute after copy .zip and before delete .zip;
Update version info for release 1.8.1
Merge pull request #468 from PowerPointLabs/hotfix-release-1.8

hotfix
Merge branch 'master' into release_v1.8
icons prepared for later version, ignore
Merge branch 'release_v1.8' into dev-1.8

Conflicts:
	PowerPointLabs/PowerPointLabs/PowerPointLabs.csproj
	PowerPointLabs/PowerPointLabs/Ribbon1.cs
	PowerPointLabs/PowerPointLabs/ThisAddIn.cs
update version info for dev-1.8.6.2