refactor fluid layout to be more specific to not interfere with modal content while adding right sidebar option

examples/fluid.html

@@ -30,7 +30,7 @@
 
     <div class="topbar">
       <div class="topbar-inner">
-        <div class="container-fluid">
+        <div class="fluid-container">
           <a class="brand" href="#">Project name</a>
           <ul class="nav">
             <li class="active"><a href="#">Home</a></li>
@@ -42,8 +42,8 @@
       </div>
     </div>
 
-    <div class="container-fluid">
-      <div class="sidebar">
+    <div class="fluid-container">
+      <div class="fluid-sidebar-left">
         <div class="well">
           <h5>Sidebar</h5>
           <ul>
@@ -68,7 +68,7 @@
           </ul>
         </div>
       </div>
-      <div class="content">
+      <div class="fluid-content">
         <!-- Main hero unit for a primary marketing message or call to action -->
         <div class="hero-unit">
           <h1>Hello, world!</h1>