VS2014 support in VSExtension

Ability to install/uninstall vsix packages through VsixPackage element from the VSExtension.

Very straight forward following of the old code as the vsix installation did not change from VS2013 to VS2014.
I see that now, but such a condition is untenable. Order the actions relative to each other and have it define itself if not already, such that each condition need only check if the newer version is defined.