[MINOR] Make scala version definition consistent in Travis.CI configuration

### What is this PR for?
Minor cleanup to make scala version definition consistent in the Travis.CI configuration

### What type of PR is it?
[Bug Fix]

Author: Luciano Resende <lresende@apache.org>

Closes #1220 from lresende/travis and squashes the following commits:

91c1fc0 [Luciano Resende] [MINOR] Make scala version profiles consistent
diff --git a/.travis.yml b/.travis.yml
index 1656f4b..0af97b9 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -39,7 +39,7 @@
 
     # Test all modules with scala 2.10
     - jdk: "oraclejdk7"
-      env: SCALA_VER="2.10" SPARK_VER="1.6.1" HADOOP_VER="2.3" PROFILE="-Pspark-1.6 -Pr -Phadoop-2.3 -Ppyspark -Psparkr -Pscalding -Pexamples" BUILD_FLAG="package -Pbuild-distr" TEST_FLAG="verify -Pusing-packaged-distr" TEST_PROJECTS=""
+      env: SCALA_VER="2.10" SPARK_VER="1.6.1" HADOOP_VER="2.3" PROFILE="-Pspark-1.6 -Pr -Phadoop-2.3 -Ppyspark -Psparkr -Pscalding -Pexamples -Pscala-2.10" BUILD_FLAG="package -Pbuild-distr" TEST_FLAG="verify -Pusing-packaged-distr" TEST_PROJECTS=""
 
     # Test all modules with scala 2.11
     - jdk: "oraclejdk7"
@@ -104,4 +104,3 @@
 
 after_script:
   - ./testing/stopSparkCluster.sh $SPARK_VER $HADOOP_VER
-