ENH: Update CircleCI yaml file

White list limited branches to build. This will ignore the dashboard
and hook branches.

Use standard MAKEFLAGS environment variable over MAKEJ.

Use less verbose wget bar over dot progress reporting.

Limit number of threads for testing.

Change-Id: I9d840fdd063f0ff6e2ce3f5bc73fdf8c38820ab9

circle.yml

@@ -1,3 +1,10 @@
+general:
+  branches:
+    only:
+      - master
+      - nightly-master
+      - release
+
 machine:
     environment:
         CTEST_DASHBOARD_ROOT: ${HOME}
@@ -10,15 +17,15 @@ machine:
         DISTCC_TCP_CORK: "0"
         DISTCC_DIR: ${HOME}/.distcc
         DISTCC_SLOTS: 3
-        MAKEJ: $(expr $CIRCLE_NODE_TOTAL \* $DISTCC_SLOTS + 1)
+        MAKEFLAGS: "-j $(expr $CIRCLE_NODE_TOTAL \\* 2 + 1)"
         CC: "gcc"
         CXX: "g++"
     post:
         - env
         - sudo apt-get install distcc
         - sudo sed -i.bak s/STARTDISTCC=\"false\"/STARTDISTCC=\"true\"/g /etc/default/distcc && sudo /etc/init.d/distcc start
         - sudo sed -i "s/false/true/g" /etc/default/sysstat && sudo sed -i "s/[0-9]*-[0-9]*\/[0-9]*/\*\/2/g" /etc/cron.d/sysstat && sudo service sysstat restart
-        - if [ ! -x "$ExternalData_OBJECT_STORES" ]; then wget --progress=dot:binary ${ITK_DATA_TAR_URL} && tar -zxf ${ITK_DATA_TAR} --strip-components=1 -C ${HOME} ; fi
+        - if [ ! -x "$ExternalData_OBJECT_STORES" ]; then wget --progress=bar:force ${ITK_DATA_TAR_URL} && tar -zxf ${ITK_DATA_TAR} --strip-components=1 -C ${HOME} ; fi
 
 dependencies:
     cache_directories:
@@ -37,6 +44,7 @@ test:
         - ctest -V -S "${DASHBOARD_BRANCH_DIRECTORY}/circleci.cmake":
             timeout: 1200
             environment:
+                ITK_GLOBAL_DEFAULT_NUMBER_OF_THREAD: 2
                 CTEST_OUTPUT_ON_FAILURE: 1
                 DASHBOARD_MODEL:  $( [[ "$CIRCLE_BRANCH" = "master" ]] && echo Continuous || echo Experimental )
                 CTEST_CONFIGURATION_TYPE: "Release"