made error to match with word boundry so errors does not match. This …

…is there to make sure build fails if provided SparkBuild has compile errors.

dev/scalastyle

@@ -18,7 +18,7 @@
 #
 
 echo -e "q\n" | sbt/sbt clean scalastyle > scalastyle.txt
-ERRORS=$(cat scalastyle.txt | grep -e "error")
+ERRORS=$(cat scalastyle.txt | grep -e "\<error\>")
 if test ! -z "$ERRORS"; then
     echo -e "Scalastyle checks failed at following occurrences:\n$ERRORS"
     exit 1