Some enhancements to binary checking.

1. Special case for inner classes of packge-private objects.
2. Made tools classes accessible when running `spark-class`.
3. Various other improvements to exclude-generation script.

Author: pwendell

.gitignore

@@ -7,6 +7,7 @@
 sbt/*.jar
 .settings
 .cache
+.mima-excludes
 /build/
 work/
 out/

.mima-exclude

@@ -41,6 +41,7 @@ if [ -f "$FWDIR"/assembly/target/scala-$SCALA_VERSION/spark-assembly*hadoop*-dep
   CLASSPATH="$CLASSPATH:$FWDIR/bagel/target/scala-$SCALA_VERSION/classes"
   CLASSPATH="$CLASSPATH:$FWDIR/graphx/target/scala-$SCALA_VERSION/classes"
   CLASSPATH="$CLASSPATH:$FWDIR/streaming/target/scala-$SCALA_VERSION/classes"
+  CLASSPATH="$CLASSPATH:$FWDIR/tools/target/scala-$SCALA_VERSION/classes"
 
   DEPS_ASSEMBLY_JAR=`ls "$FWDIR"/assembly/target/scala-$SCALA_VERSION/spark-assembly*hadoop*-deps.jar`
   CLASSPATH="$CLASSPATH:$DEPS_ASSEMBLY_JAR"