Merged in feature/from-pantheon (pull request #16)

code from pantheon

* code from pantheon

wp/wp-content/mu-plugins/pantheon-mu-plugin/inc/assets/css/return-to-pantheon-button.css

@@ -0,0 +1,63 @@
+#login {
+    width: 500px;
+}
+
+#return-to-pantheon {
+    margin-bottom: 20px;
+    display: flex; 
+    justify-content: space-between;
+    align-items: center;
+}
+
+#return-to-pantheon .left {
+    font-size: 16px;
+    font-weight: 400;
+    line-height: 1.4;
+}
+
+#return-to-pantheon a{
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    color: #000000;
+    padding: 5px 10px;
+    background: #F8DD44;
+    color: #000000 !important;
+    text-decoration: none !important;
+    font-size: 12px;
+    text-align: center;
+    border-radius: 10px;
+    min-width: 130px
+}
+
+#return-to-pantheon a:hover {
+    -webkit-transition: all 0.25s;
+    -moz-transition: all 0.25s;
+    transition: all 0.25s;
+    background: #EFD01B;
+    color: #333333 !important;
+}
+
+  #return-to-pantheon .fist-icon {
+      display: inline-block;
+      width: 12px;
+      margin-right: 5px;
+  }
+
+  @media (max-width: 499px) {
+    #login {
+        width: 320px;
+    }
+    #return-to-pantheon {
+        flex-direction: column;
+    }
+
+    #return-to-pantheon .left {
+        order: 2;
+    }
+
+    #return-to-pantheon .right {
+        margin-bottom: 25px;
+        order: 1;
+    }
+  }

wp/wp-content/mu-plugins/pantheon-mu-plugin/inc/assets/images/pantheon-fist-icon-black.svg

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="14px" height="32px" viewBox="0 0 14 32" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+    <!-- Generator: Sketch 46.2 (44496) - http://www.bohemiancoding.com/sketch -->
+    <title>Group 11</title>
+    <desc>Created with Sketch.</desc>
+    <defs></defs>
+    <g id="Page-1" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
+        <g id="WP---button" transform="translate(-322.000000, -538.000000)" fill="#333333">
+            <g id="Group" transform="translate(311.000000, 534.000000)">
+                <g id="Group-11" transform="translate(11.000000, 4.000000)">
+                    <path d="M1.54822908,0 L4.52272957,6.90999702 L0.736842105,6.90999702 L1.98837032,9.82347541 L9.66224514,9.82347541 L1.54822908,0 L1.54822908,0 Z M11.589856,24.7575559 L10.3368651,21.8425037 L8.57849426,21.8425037 L8.54163298,21.7553741 L6.11083637,16.1102593 L4.6957728,16.1102593 L7.16386951,21.8425037 L2.66269769,21.8425037 L10.7780302,31.6679821 L7.80265209,24.7575559 L11.589856,24.7575559 L11.589856,24.7575559 Z" id="Fill-1"></path>
+                    <path d="M6.3944081,15.35938 L5.16291955,12.493687 L4.54724842,12.493687 L5.77976089,15.3559463 L3.74741716,15.3559463 L6.2165378,21.0911952 L1.18058487,21.0911952 C0.756241333,21.0911952 0.522640287,21.0911952 0.330873868,20.4898718 C0.102099894,19.7718033 0,18.2748614 0,15.6365067 C0,12.9982951 0.102099894,11.5016393 0.330873868,10.7831416 C0.522640287,10.1818182 0.756241333,10.1818182 1.18058487,10.1818182 L6.73391219,10.1818182 L8.96270314,15.35938 L6.3944081,15.35938 Z M12.6233793,18.7798987 C12.7164101,18.7798987 12.9331895,18.892924 12.9331895,19.9363338 C12.9331895,20.9791714 12.7164101,21.0911952 12.6233793,21.0911952 L8.86294364,21.0911952 L7.86842046,18.7798987 L12.6233793,18.7798987 Z M12.6233793,12.493687 L8.3441065,12.493687 L7.34958333,10.1818182 L12.6233793,10.1818182 C12.7164101,10.1818182 12.9331895,10.2944143 12.9331895,11.3369657 C12.9331895,12.3800894 12.7164101,12.493687 12.6233793,12.493687 Z M13.063228,15.9142057 C13.1571364,15.9142057 13.3739159,16.0268018 13.3739159,17.0699255 C13.3739159,18.1130492 13.1571364,18.225073 13.063228,18.225073 L7.6291147,18.225073 L6.63415269,15.9142057 L13.063228,15.9142057 Z M13.063228,13.0485127 C13.1571364,13.0485127 13.3739159,13.1601073 13.3739159,14.2036602 C13.3739159,15.2463547 13.1571364,15.35938 13.063228,15.35938 L9.57837427,15.35938 L8.58297345,13.0485127 L13.063228,13.0485127 Z" id="Path"></path>
+                </g>
+            </g>
+        </g>
+    </g>
+</svg>

wp/wp-content/mu-plugins/pantheon-mu-plugin/inc/assets/js/return-to-pantheon-button.js

@@ -0,0 +1,8 @@
+jQuery(document).ready(function( $ ) {
+
+    $('#return-to-pantheon')
+	    .detach()
+	    .prependTo('#loginform')
+	    .show();
+
+});