Check for object autoImport in auto plugins. Fixes #1314
Merge pull request #1318 from sbt/topic/1314

Check for object autoImport in auto plugins.
Updated on Changes.rst
Use new sbt syntax for defining `check-compilations` task.

Some scripted tests define `check-compilations` task. We can refactor them
to be more readable by using new `.value` syntax.
Update comments in `inc-ant-style` scripted test.

I forgot to update comments after copy&pasting the test. The updated
comments describe what's being tested related to Ant mode.
Use separate update caches when cross compiling scala
Back out autogc fix to be optionally enabled.

Workaround for #1329
Modify changes with latest RC changes.
Merge pull request #1332 from sbt/wip/disable-force-gc

Default force gc to false
Merge pull request #1330 from pvlugter/cross-update-cache

Use separate update caches when cross compiling scala
Merge pull request #1328 from gkossakowski/cleanup-incremental-tests

Cleanup incremental tests
Fix project load ordering to match 0.13.5 and previous.

* root project needs to be discovered FIRST in the list.
* All other rpojects come in the order they were seen.
Disable failing derived test for now.

* Disable test of derived setting which depends on itself
* Not sure we even care about supporting that feature.
Merge remote-tracking branch 'origin/0.13.5' into wip/merge-0.13.5

Conflicts:
	main/src/main/scala/sbt/EvaluateTask.scala
Merge pull request #1333 from sbt/wip/fix-derived-setting-tests

Fixed project/derived test to pass
Merge pull request #1334 from sbt/wip/merge-0.13.5

Wip/merge 0.13.5
Bump expected 2.11 module versions so we can compile with 2.11

Add scala 2.11 test/build verification.

* Add 2.11 build configuratoin to travis ci
* Create command which runs `safe` unit tests
* Create command to test the scala 2.11 build
* Update scalacheck to 1.11.4
* Update specs2 to 2.3.11
* Fix various 2.11/deprecation removals
  and other changes.

Fix eval test failure in scala 2.11 with XML not existing.
Merge pull request #1336 from sbt/wip/compile-with-2.11

Bump expected 2.11 module versions so we can compile with 2.11
Fix pattern match on buildLoaders.

Fixes #1341
Merge pull request #1342 from sbt/wip/fix-build-loaders

Fix pattern match on buildLoaders.