Updated mediawiki/extensions
Project: mediawiki/extensions/GettingStarted  3ca054ee8a1b5f85f8814d3b39b5c7f749a5e9ab

Instrumentation of signup experiment schemas

Schemas:
1) SignupExpAccountCreationImpression
2) SignupExpAccountCreationComplete

Change-Id: I3d41ae2f6fc2ac684c8d1f1c7cc7cd9a07f5c9dc