Revision 512542

o adding a way to set the local repository using a -D option 
o make the cli handle things that are CLI specific like:
  - the $m2_home/conf/settings.xml file and the standard ~/.m2/settings.xml file, i am still falling back
    to this as people using the embedder have become used to this. but this has the effect of greatly 
    simplifying settings handling because it is up to the client code to define where settings are
    and how they should be processed
o use an embedder configuration for things like settings and the local repository which generally remain constant, another
  push toward a single source for session and request configuration information