[BUGFIX] Import the database after the composer install (#21)

This is required to fix the build as the database structure that is going
to be imported is only available after the composer install.

Also lock the Travis builds to precise to avoid failures when getting
a build on Trusty.

.travis.yml

@@ -1,5 +1,7 @@
 language: php
 
+dist: precise
+
 matrix:
   include:
   - php: 7.0
@@ -22,15 +24,17 @@ cache:
 
 before_install:
   - phpenv config-rm xdebug.ini
+
+install:
+  - composer install
+
+before_script:
   - >
     echo;
     echo "Importing the database schema";
     mysql -e "CREATE DATABASE ${PHPLIST_DATABASE_NAME};";
     mysql ${PHPLIST_DATABASE_NAME} < vendor/phplist/phplist4-core/Database/Schema.sql;
 
-install:
-  - composer install
-
 script:
   - >
     echo;