Update VE core submodule to master (0f178b5)

New changes:
636d84e Optionally allow undo while staging
8d75e08 Don't fix selection on document focus if focusedNode is set
42c35dd Fallback options for receiving bad information into Scalable object
3a07dd0 Remove last jQuery.browser uses with temporary ve.isMsie hack
f265c86 Localisation updates from https://translatewiki.net.
6a8c609 Localisation updates from https://translatewiki.net.
0343976 Update OOjs UI to v0.1.0-pre (469d40c88f)
0b684c5 ActionDialog: Allow errors to be jQuery objects

Change-Id: I5ac0b828ed4b7c492cd770b1e980d02e60128740