Work on refactoring measurements out of Lesion Tracker package

- Removed AssociatedStudies Collection
- Measurement API is generated from configuration files
- Data exchange methods are defined in configuration

Packages/ohif-viewerbase/client/components/viewer/loadingIndicator/loadingIndicator.html

@@ -0,0 +1,14 @@
+<template name="loadingIndicator">
+    <div class="imageViewerLoadingIndicator loadingIndicator">
+        <div class="indicatorContents">
+            <p>Loading... <i class="fa fa-spin fa-circle-o-notch fa-fw"></i> {{percentComplete}}</p>
+        </div>
+    </div>
+    <div class="imageViewerErrorLoadingIndicator loadingIndicator">
+        <div class="indicatorContents">
+            <h4>Error Loading Image</h4>
+            <p class='description'>An error has occurred.</p>
+            <p class='details'></p>
+        </div>
+    </div>
+</template>