Fixed Window spark shell launch script error.

 JIRA SPARK-1029:https://spark-project.atlassian.net/browse/SPARK-1029

bin/spark-class2.cmd

@@ -73,7 +73,7 @@ for %%d in ("%TOOLS_DIR%\target\scala-%SCALA_VERSION%\spark-tools*assembly*.jar"
 
 rem Compute classpath using external script
 set DONT_PRINT_CLASSPATH=1
-call "%FWDIR%sbin\compute-classpath.cmd"
+call "%FWDIR%bin\compute-classpath.cmd"
 set DONT_PRINT_CLASSPATH=0
 set CLASSPATH=%CLASSPATH%;%SPARK_TOOLS_JAR%
 

bin/spark-shell.cmd

@@ -18,6 +18,6 @@ rem limitations under the License.
 rem
 
 rem Find the path of sbin
-set SBIN=%~dp0..\sbin\
+set BIN=%~dp0..\bin\
 
-cmd /V /E /C %SBIN%spark-class2.cmd org.apache.spark.repl.Main %*
+cmd /V /E /C %BIN%spark-class2.cmd org.apache.spark.repl.Main %*