fix a wildcard bug in make-distribution.sh; tell sbt to check local maven repo in SparkBuild.scala

fixed a wildcard bug in make-distribution.sh:
move the wildcard out of the quotes so that the cp command won't fail.

ask sbt to check local maven repo in SparkBuild.scala:
To build Spark (0.9.0-SNAPSHOT) with the HEAD of mesos (0.15.0), I must do "make maven-install" under mesos/build, which publishes the java .jar file under ~/.m2. However, when building Spark (after pointing mesos to version 0.15.0), sbt uses ivy which by default only checks ~/.ivy2. This change is to tell sbt to also check ~/.m2.