metamaps.debug function, and move VERSION into a rails constant initializer.

from this commit on, we would need to modify config/initializers/version.rb to increment the version number.

app/assets/javascripts/src/Metamaps.Debug.js.erb

@@ -0,0 +1,7 @@
+Metamaps.Debug = function() {
+  console.debug(Metamaps)
+  console.debug(`Metamaps Version: ${Metamaps.VERSION}`)
+}
+Metamaps.debug = function() {
+  Metamaps.Debug()
+}

app/assets/javascripts/src/Metamaps.js.erb

@@ -16,11 +16,12 @@ var labelType, useGradients, nativeTextSupport, animate;
     animate = !(iStuff || !nativeCanvasSupport);
 })();
 
-// TODO eliminate these 4 top-level variables
+// TODO eliminate these 5 top-level variables
 Metamaps.panningInt = null;
 Metamaps.tempNode = null;
 Metamaps.tempInit = false;
 Metamaps.tempNode2 = null;
+Metamaps.VERSION = '<%= VERSION %>'
 
 Metamaps.Settings = {
     embed: false, // indicates that the app is on a page that is optimized for embedding in iFrames on other web pages

app/views/layouts/_lightboxes.html.erb

@@ -18,7 +18,7 @@
 
             <div id="rightAboutParms">
                 <p>PRIVATE BETA</p>
-                <p>2.8</p>
+                <p><%= VERSION %></p>
                 <p>Mar 26, 2016</p>
             </div>
             <div class="clearfloat">

config/initializers/version.rb

@@ -0,0 +1 @@
+VERSION = '2.8.3'