In order to be able to clean up broken steps in the release, one should
be able to run each step individually. So now one needs to specifiy each
step to run via cmdline argument
* --deploy-sonatype: runs `mvn deploy` and pushes to the staging mvn repo
* --deploy-s3: copies all artifacts over to the s3bucket
* --deploy-s3-repos: Creates the s3 repositories
* --no-install option, so that an existing mvn repo can be used for s3 operations
Also, several minor changes have been added
* Fixed typo in smoke test reference for email
* Checking for correct AWS environment variables
* Only create releases directory if it does not exist
* RPM sign check is only executed after `mvn install`
* Various path fixes for deb/rpm-s3 uploads
* Added output of deb/rpm-s3 commands for easier debugging
* Add configurable destination s3 bucket
* Removed verbosity, always be verbose
* Added color to the command which is being running right now, to differentiate from console output
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