Merged LesionTracker and OHIF Viewer, refactored out common components

Packages/viewerbase/components/basic/layout/layout.html

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+<template name="layout">
+    <nav class="navbar navbar-default" role="navigation">
+        <div class="container-fluid">
+            <div class="navbar-header">
+                <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
+                  <span class="sr-only">Toggle navigation</span>
+                  <span class="icon-bar"></span>
+                  <span class="icon-bar"></span>
+                  <span class="icon-bar"></span>
+                </button>
+                <a class="navbar-brand" href="/">OHIF Viewer</a>
+            </div>
+            <div id="navbar" class="navbar-collapse collapse">
+                <ul class="nav navbar-nav navbar-right">
+                    <li>
+                        <a href="http://www.ohif.org">About</a>
+                    </li>
+                    <li>
+                        <form class="navbar-form">
+                            <div class="form-group">
+                                {{> loginButtons align="right"}}
+                            </div>
+                        </form>
+                    </li>
+                </ul>
+            </div>
+        </div>
+    </nav>
+
+    {{> yield}}
+</template>

Packages/viewerbase/components/basic/layout/layout.styl

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+.navbar
+  margin-bottom: 0
+  border-radius: 0px
+
+.navbar-form
+  margin: 0
+  padding: 15px 3px
+
+.navbar-default
+  -webkit-transition: background-color 200ms linear
+  -moz-transition: background-color 200ms linear
+  -o-transition: background-color 200ms linear
+  -ms-transition: background-color 200ms linear
+  transition: background-color 200ms linear
+  
+@media (min-width: 768px)
+  .navbar
+    border-radius: 0px