Revert "Removed non-future handlers"

This reverts commit 9b919b9b813d21e8baa905819f556231e2f7c811.

Conflicts:
	scruffy-server/src/test/scala/com/sksamuel/scruffy/AjaxMatcherTest.scala
	scruffy-server/src/test/scala/com/sksamuel/scruffy/CacheFilterTest.scala
	scruffy-server/src/test/scala/com/sksamuel/scruffy/CompressionTest.scala
	scruffy-server/src/test/scala/com/sksamuel/scruffy/CorsTest.scala
	scruffy-server/src/test/scala/com/sksamuel/scruffy/HeadersTest.scala
	scruffy-server/src/test/scala/com/sksamuel/scruffy/MethodMatcherTest.scala
	scruffy-server/src/test/scala/com/sksamuel/scruffy/ParamsTest.scala
	scruffy-server/src/test/scala/com/sksamuel/scruffy/StatusCodeTest.scala