Update VE core submodule to master (9c19df0)

New changes:
0318f64 Fix copyright year range for one file not updated to 2011-2014
4dbd57e Add <base> for relative URLs in tests
554cde9 Localisation updates from https://translatewiki.net.
c32448a Update OOjs UI to v0.1.0-pre (1c7875205a)
8f675c8 Localisation updates from https://translatewiki.net.
4fb929c Add a <base> to every test document by default
09c404c Protect against invalid/absent <base> in ve.resolveUrl()
05924db Use DOMParser in ve.createDocumentFromHtml() if available
9c19df0 Update OOjs UI to v0.1.0-pre (e697490c9b)

Local changes:
Use ve.dm.example.base for link tests in mwExample

Change-Id: I384e2a2edeebe9379de4910889a61670d9f734f5