Set environment in single place

Signed-off-by: Michal Čihař <michal@cihar.com>

.travis.yml

@@ -23,6 +23,7 @@ env:
     - TESTSUITE_BROWSERSTACK_USER=phpMyAdmin
     - TESTSUITE_USER=root
     - TESTSUITE_PASSWORD=root
+    - TESTSUITE_URL=http://127.0.0.1:8000
 
 before_script:
   - export PATH=~/.composer/vendor/bin/:$PATH
@@ -67,7 +68,6 @@ before_script:
 script:
   - ant locales
   - set -e; if [[ -z "$LINT" ]] ; then
-    export TESTSUITE_URL="http://127.0.0.1:8000" ;
     if [[ $TRAVIS_PHP_VERSION == "hhvm" ]] ; then
     ant phpunit-hhvm ;
     else