[UI] Adds Toolbar buttons.

Adds the views.buttons package containing the buttons for the toolbar.

Change-Id: Ibfabd7a47baef0b4f2507f86b172f5424afb18ec
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1959
Tested-by: Jenkins CI
Reviewed-by: Stefan Rossbach <srossbach@arcor.de>
Reviewed-by: Holger Schmeisky <google@schmeisky.com>
[REFACTOR] Updates Saros/I IPN like Saros/E IPN

Change-Id: I4203d9e1a69366b9e2ef73fed2ac7f69f94b89e2
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1962
Reviewed-by: Stefan Rossbach <srossbach@arcor.de>
Tested-by: Jenkins CI
Reviewed-by: Holger Schmeisky <google@schmeisky.com>