!tes #3638 ImplicitSender and DefaultTimeout requires TestKitBase
=tes #3638 Testing DefaultTimeout trait
=doc #3763 add actor creation ordering guarantees
=pro Fix doc build of java only projects

* javadoc complains on the -target flag for projects with only java sources
* found solution here: https://groups.google.com/forum/#!topic/simple-build-tool/I75AODwFlH0
=doc Fix a few typos in docs
=pro Exclude osgi samples from zips, (fails, no content)
Merge pull request #1864 from akka/wip-creation-ordering-∂π

=doc #3763 add actor creation ordering guarantees
Merge pull request #1894 from akka/wip-doc-typos-patrikw

=doc Fix a few typos in docs
Merge pull request #1893 from akka/wip-doc-build-patriknw

=pro Fix doc build of java only projects
=per #3771 Snapshot file names are only read on system startup

- snapshot file names are no longer cached
- they are read on every load attempt on a per-processor basis
Merge pull request #1888 from archie/wip-3638-implicitsender-requires-testkitbase-archie

!tes #3638 ImplicitSender and DefaultTimeout requires TestKitBase
Merge pull request #1890 from krasserm/wip-3771-sync-snapshot-filenames-krasserm

=per #3771 Snapshot file names are only read on system startup
Merge remote-tracking branch: upstream/master