Fix initialization order problem in tests.
The real regression is a lazy val in a trait.
Upgrade to Specs2 2.x.
Merge branch '2.2.x_2.9' into 2.2.x_2.10
Revert "Upgrade to Specs2 2.x."  Not as compatible as I'd hoped.
Defer to 2.3.x.

This reverts commit 847414f76dcd04a08e76fae56d05e646a144219a.
Merge branch '2.2.x_2.9' into 2.2.x_2.10
Integrate sbt-mima-plugin.
Backport changes on 2.2.x_2.10 branch.
Merge branch '2.2.x_2.9' into 2.2.x_2.10

Conflicts:
	atmosphere/src/main/scala/org/scalatra/atmosphere/ScalatraAtmosphereHandler.scala
	commands/src/main/scala/org/scalatra/commands/executors.scala
	core/src/main/scala/org/scalatra/FutureSupport.scala
	core/src/main/scala/org/scalatra/ScalatraBase.scala
	core/src/test/scala/org/scalatra/ContentTypeTest.scala
	scalate/src/main/scala/org/scalatra/scalate/ScalateSupport.scala
	scalate/src/test/scala/org/scalatra/scalate/ScalateFuturesSupportSpec.scala
HaltException and PassException are Throwables with NoStackTrace.
Filter acceptable bincompat issues in core.
Merge branch '2.2.x_2.9' into 2.2.x_2.10
Revert incompatible Swagger work from 2.2.x.  Will be reinstated in 2.3.x.

Reverts:
* 462dc01f981aed89b2a196bbbe28604d1f937025
* 93358935e40df9eecfdd608e6696e3cbd68cf4cc
* 34e241298c2e89843e58a51ebab255f0fb76d20b
* 71f39b06f82e7bca388f2d08af3a4d2e5e80f54d
* 5ef55e18d8f0ea6f550580a624070a0ed473337c
* f93e7acd6bc513e77408246159841d2c40af3d5a
* 3aadd83d7b3e346ea00553b4e154dcfed6109338
* 41905f6cad9277c0693f8319e90cfab39f7f1437
* 880f0c640fe49f8f31f2b53f2e50681dc793b7e7
Merge branch '2.2.x_2.9' into 2.2.x_2.10

Conflicts:
	swagger/src/main/scala/org/scalatra/swagger/package.scala
Fix atmosphere disconnect handling

Only remove session attribute _after_ the client is retrieved from the session and sent the `Disconnected` message.
Also removing the pointless first `isCancelled` check.
Conflicts:
	atmosphere/src/main/scala/org/scalatra/atmosphere/ScalatraAtmosphereHandler.scala
Allow Accept-Encoding header to be a list
Remove unused import
This should allow using scalate with i18n support in ScalatraFilter as well as in ScalatraServlet.
On the second thought this should do the trick even better.
Upgrade to Scalaz 7.0.4.