Set absolute path for SPARK_HOME

alltests

 #!/bin/bash
-FWDIR=`dirname $0`
+FWDIR="`dirname $0`"
 if [ "x$SPARK_MEM" == "x" ]; then
   export SPARK_MEM=500m
 fi

run

 #!/bin/bash
 
 # Figure out where the Scala framework is installed
-FWDIR=`dirname $0`
+FWDIR="$(cd `dirname $0`; pwd)"
 
 # Export this as SPARK_HOME
 export SPARK_HOME="$FWDIR"