.travis.yml: quote bash commands to preserve special characters

.travis.yml

@@ -47,5 +47,5 @@ before_script:
   - until netstat -an 2>/dev/null | grep '8080.*LISTEN'; do true; done
 
 script:
-  - php scripts/run-tests.sh --url http://127.0.0.1:8080 --php $(phpenv which php) --concurrency 2 --verbose --color "Organic groups","Organic groups access","Organic groups context","Organic groups field access","Organic groups UI" 2>&1 | tee /tmp/simpletest-result.txt
-  - ! egrep -i "([1-9]+ fail)|(Fatal error)|([1-9]+ exception)" /tmp/simpletest-result.txt
+  - 'php scripts/run-tests.sh --url http://127.0.0.1:8080 --php $(phpenv which php) --concurrency 2 --verbose --color "Organic groups","Organic groups access","Organic groups context","Organic groups field access","Organic groups UI" 2>&1 | tee /tmp/simpletest-result.txt'
+  - '! egrep -i "([1-9]+ fail)|(Fatal error)|([1-9]+ exception)" /tmp/simpletest-result.txt'