overhaul frontpage jumbotron, add js for twitter buttons back in, fix up some form ids and classes, straighten out the use of primary button variable

lib/buttons.less

@@ -59,7 +59,7 @@
   &.primary {
     color: @white;
     text-shadow: 0 -1px 0 rgba(0,0,0,.25);
-    .gradientBar(@blue, @blueDark)
+    .gradientBar(@primaryButtonBackground, spin(@primaryButtonBackground, 15));
   }
 
    // Transitions

lib/forms.less

@@ -133,10 +133,16 @@ input[type=image] {
   .box-shadow(none);
 }
 
+// Make textarea height behave
 textarea {
   height: auto;
 }
 
+// Hidden inputs
+input[type=hidden] {
+  display: none;
+}
+
 
 
 // CHECKBOXES & RADIOS

lib/mixins.less

@@ -134,12 +134,14 @@
 // Border Radius
 .border-radius(@radius: 5px) {
   -webkit-border-radius: @radius;
+     -moz-border-radius: @radius;
           border-radius: @radius;
 }
 
 // Drop shadows
 .box-shadow(@shadow: 0 1px 3px rgba(0,0,0,.25)) {
   -webkit-box-shadow: @shadow;
+     -moz-box-shadow: @shadow;
           box-shadow: @shadow;
 }
 
@@ -179,6 +181,7 @@
 // Heads up: FF 3.6 and under need "padding" instead of "padding-box"
 .background-clip(@clip) {
   -webkit-background-clip: @clip;
+     -moz-background-clip: @clip;
           background-clip: @clip;
 }
 

lib/variables.less

@@ -45,7 +45,7 @@
 @baseLineHeight:        18px;
 
 // Buttons
-@primaryButtonColor:    @blue;
+@primaryButtonBackground:    @linkColor;