change to circular loading for datasources
<span class="hint">Identify the Processor and Properties that define the source and destination datasources.</span>
<div ng-if="vm.loadingProcessorDatasources" layout="column" layout-align="start center" class="layout-padding-top-bottom">
- <md-progress-linear md-mode="indeterminate"></md-progress-linear>
+ <md-progress-circular md-mode="indeterminate"></md-progress-circular>
<span>Loading ...</span>
</div>
