Issue #8 - Added a boolean to the configuration for whether or not we should prepend the source branch in the tag name.  This allows each project to decide if that part of the tag is important to their workflow or not.  Fixed the regexes used in the SCMService implementations to match the pattern that is used for tagging inside of the ReleasePlugin itself.  The release plugin was building *-RELEASE-* while the SCMService implementations were looking for *-REL-*.  These are now all using *-RELEASE-* (with checks for the prependSourceBranch flag...)