adapt to altoo-ag and publish to sonatype

[danischroeter]

we need to

• change the artifact groupid to io.altoo (#162)
• change the packages to io.altoo (#162)
• register with sonatype and get agreement
• publish to sonatype/maven1
• create a guide on how to migrate
• move config root out of akka namespace

all this while maintaining as minimal config changes necessary as possible...
although we might as well really cleanup the config see #63 and try to implement convention over configuration - but completely break the current config...

see
https://www.scala-sbt.org/1.x/docs/Using-Sonatype.html

[danischroeter]

duplicates #43

[danischroeter]

package:
io.altoo.akka.serialization.kryo

drop standalone scala support/package since this is tied to deeply to akka anyway - however if anybody wants he could use the integrated serializers...

[danischroeter]

sonatype done with RC4 - ready to do the 1.0.0 once we are done testing...