Merge pull request #435 from mapbox/separate-tests-script

bring back Linux tests in separate script

scripts/run_tests.sh

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+set -e
+set -o pipefail
+
+cd build/Testing
+
+for TEST in ./test_* ; do
+    ${TEST}
+done

scripts/travis_script.sh

@@ -9,11 +9,7 @@ if [[ ${TRAVIS_OS_NAME} == "linux" ]]; then
     #
     make linux -j4 BUILDTYPE=${BUILDTYPE}
     make test -j4 BUILDTYPE=${BUILDTYPE}
-    cd build/Testing
-    for TEST in ./test_* ; do
-        ${TEST}
-    done
-    cd ../..
+    ./scripts/run_tests.sh
     (cd ./node_modules/mapbox-gl-test-suite/ && (./bin/compare_images.js || true; ./bin/deploy_results.sh))
 elif [[ ${TRAVIS_OS_NAME} == "osx" ]]; then
     #