(INCOMPLETE) Upgrade for 2.11

Just throwing this out there since it's something we probably want to do. We'll of course want to cross-compile so that breeze works for both 2.10 and 2.11, at least in the near term. 

    [warn] 	::::::::::::::::::::::::::::::::::::::::::::::
    [warn] 	::          UNRESOLVED DEPENDENCIES         ::
    [warn] 	::::::::::::::::::::::::::::::::::::::::::::::
    [warn] 	:: org.scalanlp#breeze-macros_2.11;0.3: not found
    [warn] 	:: org.spire-math#spire_2.11;0.7.1: not found
    [warn] 	:: org.scala-lang.plugins#macro-paradise_2.11.0;2.0.0-SNAPSHOT: not found