Replace existing methods with UploadThemeFile() and CreateComposedLook() functions
Recursive set theme and master pages
New test for composed look
Additional tests for composed looks.
Additional unit tests for composed looks and some bug fixes
Additional composed look bug fixes
Add GetComposedLook and rename existing GetCurrent and Exists.
Merge branch 'dev' into ComposedLook

Conflicts:
	OfficeDevPnP.Core/OfficeDevPnP.Core.Tests/AppModelExtensions/BrandingExtensionsTests.cs
	OfficeDevPnP.Core/OfficeDevPnP.Core/AppModelExtensions/BrandingExtensions.cs
Add Ignore attribute for solution package install/uninstall tests as the function (incorrectly) wipes composed looks, breaking other tests.
Merge branch 'dev' into ComposedLook
Proj file change
Merge remote-tracking branch 'contributor/composedlook' into pr254
merging of pr254. Some small changes done (availability of the __InheritsThemedCssFolderUrl web property + cleanup of tests)