Merge pull request #71 from DanTup/master

Make it clear the SDK download is now optional.
Removed task list from README.

Closes #69.
Export classification type definitions for each highlight region type (fixes #63)
Fix build dependencies on item and project template projects
Remove duplicated variables in QuickInfoSourceProvider
Hide the References node in Solution Explorer (fixes #61)
Remove dead code
Remove the Build, Rebuild, and Clean commands from the project context menu (fixes #62)
Update visibility and state of Build, Rebuild, and Clean menu items on the Build menu
Merge pull request #72 from sharwell/fix-63

Export classification type definitions for each highlight region type
Merge pull request #76 from sharwell/fix-61

Hide the References node in Solution Explorer
Merge pull request #75 from sharwell/duplicate-vars

Remove duplicated variables in QuickInfoSourceProvider
Merge pull request #74 from sharwell/dependencies

Fix build dependencies on item and project template projects
Merge pull request #77 from sharwell/fix-62

Updated handling for the Build, Rebuild, and Clean commands