Improved Add Bike view

Worked out some bootstrap overrides issues

app/controllers/bikes_controller.rb

@@ -1,6 +1,10 @@
 class BikesController < AuthenticatedController
 
   def new
+    @brands = BikeBrand.all.map{ |b| [b.brand, b.id] }
+    @brands.unshift( ["Select a brand", -1] )
+    @wheel_sizes = BikeWheelSize.all.map{ |w| [w.display_string, w.id] }
+    @wheel_sizes.unshift( ["Select a wheel size", -1] )
   end
 
 end