git ignore for reshaper stuff
fixes #472, updated version info for release-1.8.2.4  as well
Merge branch 'master' into release_v1.8
fixes #473 by checking save status and auto save the file
fixes #473, resolves some cross-version conflicts because of branch switching
fixes #486 by change the event handler to MouseDown instead of Click
resolves #484
fixes #482
fixes #479
Issue #483: change label's the font to calibri
Issue #474: use a hidden pptx as shape storage, add shape resolved
Massive refactoring done.
Issue #474: double click, context menu events handled in the new model
Issue #474: Add to shape pane, rename, remove, add back to slide verified
Issue #474: fixes reloading bug by override presentation Open method to add existing category into the collection
Issue #474: fixes rename bug
resolves #474
Issue #488: file extension will be changed when close and changed back when open.
fixes a find shape bug
Merge branch 'Feature-CustomShapes' into dev-1.8

Conflicts:
	PowerPointLabs/PowerPointLabs/Ribbon1.cs
	PowerPointLabs/PowerPointLabs/TextCollection.cs
	PowerPointLabs/PowerPointLabs/ThisAddIn.cs
Merge branch 'release_v1.8' into dev-1.8

Conflicts:
	.gitignore
	PowerPointLabs/PowerPointLabs/PowerPointLabs.csproj
	PowerPointLabs/PowerPointLabs/Ribbon1.cs
	PowerPointLabs/PowerPointLabs/ThisAddIn.cs