Update VE core submodule to master (27de0c4)

New changes:
016642e Remove crazy space exception from link validity regex
b538834 Remove insertion inspector class
50839f5 Work around *another* browser bug in getBoundingClientRect
e2e916a Increase inspector height by 1 to deal with Chrome opacity bug
9e387da Update OOjs UI to v0.1.0-pre (40de4dabe6)
27de0c4 Follow-up I2f34448: ve.ui.InsertionInspector.js was deleted, so remove from manifest

Change-Id: If979beb12fe865c0e217b93381769264e2efdc20