=pro clean up build

- move license and homepage into build definition
- enable sbt-license-report plugin to properly pick it up
- remove hand-coded XML (always a good idea)
- remove ls.implicity.ly plugin
- remove STM reference from README
=doc #3564 Moving the Actor DSL doc section
=act Normalize DeathWatch Debug events' messages
=act #3800: Add timeout value in AskTimeoutException message.
=doc Replace old NetBeans plugin information
=act #3634, #3796 Fixing errors in code comments
Merge pull request #1851 from akka/wip-build-license-∂π

move license and homepage definition into build
Merge pull request #1898 from archie/wip-3564-moving-actordsl-documentation-archie

=doc #3564 Moving the Actor DSL doc section
Merge pull request #1899 from gramk/wip-log-ask-timeout

=act #3800: Add timeout value in AskTimeoutException message.
Merge pull request #1903 from drexin/wip-3624-drexin

=act #3634, #3796 Fixing errors in code comments
Merge pull request #1907 from jozic/normalize-deatchwatch-debug

=act Normalize DeathWatch Debug events' messages
Merge pull request #1908 from jcranky/master

replacing the suggested netbeans plugin information, the old one is outd...
Merge remote-tracking branch: upstream/master