Update VE core submodule to master (fa14d31)

New changes:
1bc3c99 Remove Firefox cursoring hack
5ebd89a Separate demo into mobile demo and desktop demo
3714877 Add test files to dependency tree
2aecf95 Localisation updates from https://translatewiki.net.
e750fb7 Update OOjs UI to v0.1.0-pre (d4086ff6e6)
363f2a1 Phantom optimisations
edfd5cb Localisation updates from https://translatewiki.net.
6fed173 Localisation updates from https://translatewiki.net.
0dd3402 Update OOjs UI to v0.1.0-pre (521a9e242b)
50ad883 Localisation updates from https://translatewiki.net.
501afaf Update OOjs UI to v0.1.0-pre (0fbf6bd14e)
cdaf6c1 Localisation updates from https://translatewiki.net.
682b4d0 Phantom optimisations, episode II
e1721a2 Move DesktopSurface and DesktopContext to visualEditor.desktop
857d463 Make $window a property of ce.Surface
fa14d31 Update OOjs UI to v0.1.0-pre (0436296667)

Change-Id: I13d7dd9289f273b938fdb070cec12ff998351265
Merge "Update VE core submodule to master (fa14d31)"