renamed groupId of beam modules
renamed artifactId from beam-* to snap-* or s3tbx-*
updated names of module dependencies in module.xml
changed versions in module.xml and pom.xml to 0.5 respectively 0.5-SNAPSHOT
all projects use nexus server now
changed snap version
replaced beam and ceres by snap modules

added new nexus repository
replaced beam and ceres by snap in extensions points
Merge branch 'master' into module_renaming

Conflicts:
	s2tbx-reader-cs/pom.xml
fixed email