Fix the doc of select.scala.html

Add the `options` parameter and edit `args` doc to inform about the slecial argument for default values.
Fix the doc of requireJs.scala.html

Change the main description from "Generate an HTML form". Add `productionFolderPrefix` and `folder` parameters.
extract code from forms doc:part1
Fixed error message when stopping NettyServer.

Akka(Invoker) had already been removed by this commit.
https://github.com/playframework/Play20/commit/767ba2f#L7L145
Now, only Logger is stopped here.
extract code from scala form doc
add little more test verificate
Merge remote-tracking branch 'upstream/master' into extract-doccode-scala-forms
extract code from global scala doc
extract code from scala xml doc
Merge pull request #1280 from XuefengWu/extract-doccode-scala-global

extract code from global scala doc
Merge pull request #1263 from XuefengWu/extract-doccode-scala-forms

Extract doccode scala forms
Merge pull request #1284 from XuefengWu/extract-doccode-scala-xml

extract code from scala xml doc
Removed the remaining utility methods around using Scala's promises. The cost of maintaining the code vs the utility of the methods is not seen.
Circumvent a problematic test for now
Leveraged Akka's scheduler for submitting tasks that need to schedule just once. This should also help consolidate some threads.
Removed some unnecessary warnings
Ensured ScalaAkkaSpec waited for a reasonable amount of time
Merge pull request #1260 from tototoshi/fix-message-on-stopping-netty-server

Fixed error message when stopping NettyServer.
Merge pull request #1254 from OlivierBlanvillain/patch-1

Fix the doc of select.scala.html
Merge pull request #1255 from OlivierBlanvillain/patch-2

Fix the doc of requireJs.scala.html