Merge pull request #1862 from lift/msf_issue_930

Use a custom implicitNotFound error for CSS transforms

This adds a custom error message that provides a bit more direction
when we can't find an implicit converter for a CSS transform. Tested it
out by creating an error in a spec... it looks like this!

    [error] ...: The value you're attempting to use on the right hand side of
       the #> operator can't be automatically converted to a (NodeSeq)=>NodeSeq
       function. Consider binding the individual members of the class you're trying to
       use, or define an implicit CanBind[T] that tells Lift how to convert this to a
       (NodeSeq)=>NodeSeq.
    [error]       ".foo" #> Bacon("boo!")
    [error]              ^
    [error] one error found

core/util/src/main/scala/net/liftweb/util/CssSel.scala

@@ -4,6 +4,7 @@ package util
 import common._
 import xml._
 import collection.mutable.ListBuffer
+import scala.annotation.implicitNotFound
 
 /**
  * Created with IntelliJ IDEA.
@@ -753,6 +754,7 @@ final class CssJBridge extends CssBindImplicits {
 
 }
 
+@implicitNotFound("The value you're attempting to use on the right hand side of the #> operator can't be automatically converted to a (NodeSeq)=>NodeSeq function. Consider binding the individual members of the class you're trying to use, or define an implicit CanBind[T] that tells Lift how to convert this to a (NodeSeq)=>NodeSeq.")
 trait CanBind[-T] {
   def apply(it: => T)(ns: NodeSeq): Seq[NodeSeq]
 }