updated: added ui-bootstrap to core.
updated: styled progress bars for lens apps.
updated: merged ui-bootstrap with lens-ui and cleaned up the namespace.
updated: removed standalone ui-bootstrap.
fixed: don't bundle ui-bootstrap anymore.
added: support one time subscribers for events.
tweaked: improve vertical alignment of smaller progress bars.
updated: samples updated to use new lens angular namespaces.
updated: revision bump for latest cosmetic changes.