Add "follow reference" to go to typedef#519

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Mortal wants to merge 3 commits intoxavierd:masterfrom Mortal:follow_reference

+23-9

Commits on Mar 1, 2017

Change confusing docstring
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Make gotoDeclaration support going to the type declaration (e.g. typedef statement)
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Add type_declaration argument to s:GotoDeclaration and functions g:ClangFollowReference[Preview]
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