ARQ-638 Split option into "setupCleanServerBaseDir" {true|false} and "cleanServerBaseDir" {dirpath}.
By default setup a clean server base dir in System.getProperty("java.io.tmpdir")/arquillian-temp-container.
ARQ-638 Add "cleanServerBaseDir" option to embedded container configuration.
Set the system property "jboss.embedded.root" (backward compatibility).
Remove release specific version qualifiers from README
Remove SNAPSHOT reference in assembly.xml namespace declaration and use official schemaLocation.