Shutdown cluster in migrate & initialize

This should be done to release resources, which is relevant when used
in a running application (e.g. Play).

Another great thing to accept an existing session in CassandraMigrator,
so that the application using it could just pass the session its
creating anyways. I didn't do this because migrate/initialize right
now accept a DataStore which would then be obsolete, at least it's not
straight forward to allow both - probably there would be 2 constructors:
1 accepting a DataStore and another one accepting a session.
Change cluster.shutdown to cluster.close (after update to datastax 2)
Merge pull request #5 from magro/shutdown-cluster

Shutdown cluster in migrate & initialize
- added optional port for DataStore
- added intellij idea sbt plugin
fix .gitignore and remove obsolete .idea_modules dir
Remove Gradle build, add empty build.sbt so that IDEA can import project
Clean up ignored files
Rebrand from StreamSend to Chris O'Meara
Add build.properties to explicitely specify sbt version
Add sonatype publishing info, allows to run publishSigned

Following http://www.scala-sbt.org/0.13/docs/Using-Sonatype.html.
Fix organization to point to a domain name.

This assumes, that chrisomeara.com is owned by Chris O'Meara (which
is usually required by sonatype)
Update datastax and scala version
Add cross publishing for scala 2.10 and 2.11.

argot and scalatest had to be updated for this. For argot there's not
yet a publicly available build for scala 2.11 (see bmc/argot#11), therefore
for now I've published it to my bintray repo. As soon as argot is
available for 2.11 in maven central, the argot version can be updated
and the resolver for bintray can be removed.
Merge branch 'magro-sbt-sonatype-publishing'
Update readme with versions and Maven info
Add Sonatype sbt plugin
Merge branch 'master' of github.com:fkoehler/pillar into fkoehler-master

Conflicts:
	.gitignore
	project/plugins.sbt
Merge branch 'fkoehler-master'
Change migrator interface to accept session.
Remove data store class.
Update version to 2.0.0