Use one-way binding in loading indicator for gr-change-view
Use one-way binding in loading indicator for gr-change-view

Also hide the changes via the hidden attribute upon initial load.
The evaluation of hidden$= will set it correctly.

Change-Id: I7d3207c622e03988da2c3020a2c698811b299f9a

joshuawilson/merrit,gerrit-review/gerrit,joshuawilson/merrit,gerrit-review/gerrit,GerritCodeReview/gerrit,qtproject/qtqa-gerrit,qtproject/qtqa-gerrit,joshuawilson/merrit,gerrit-review/gerrit,GerritCodeReview/gerrit,MerritCR/merrit,joshuawilson/merrit,joshuawilson/merrit,MerritCR/merrit,joshuawilson/merrit,GerritCodeReview/gerrit,qtproject/qtqa-gerrit,WANdisco/gerrit,GerritCodeReview/gerrit,qtproject/qtqa-gerrit,qtproject/qtqa-gerrit,WANdisco/gerrit,gerrit-review/gerrit,MerritCR/merrit,GerritCodeReview/gerrit,MerritCR/merrit,MerritCR/merrit,WANdisco/gerrit,MerritCR/merrit,gerrit-review/gerrit,WANdisco/gerrit,WANdisco/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,qtproject/qtqa-gerrit,gerrit-review/gerrit,WANdisco/gerrit,WANdisco/gerrit,MerritCR/merrit,MerritCR/merrit,qtproject/qtqa-gerrit,joshuawilson/merrit,joshuawilson/merrit,GerritCodeReview/gerrit,gerrit-review/gerrit