Include PDO code coverage, remove unnecessary line on phpunit xml
diff --git a/.travis.yml b/.travis.yml
index 84029b9..033fd6a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,14 +8,17 @@
   - DB=mysql
   - DB=pgsql
   - DB=sqlite
+  - DB=pdo/mysql
+  - DB=pdo/pgsql
+  - DB=pdo/sqlite
 
 before_script:
   - pyrus channel-discover pear.php-tools.net
   - pyrus install http://pear.php-tools.net/get/vfsStream-0.11.2.tgz
   - phpenv rehash
-  - sh -c "if [ '$DB' = 'pgsql' ]; then psql -c 'DROP DATABASE IF EXISTS ci_test;' -U postgres; fi"
-  - sh -c "if [ '$DB' = 'pgsql' ]; then psql -c 'create database ci_test;' -U postgres; fi"
-  - sh -c "if [ '$DB' = 'mysql' ]; then mysql -e 'create database IF NOT EXISTS ci_test;'; fi"
+  - sh -c "if [ '$DB' = 'pgsql' | '$DB' = 'pdo/pgsql' ]; then psql -c 'DROP DATABASE IF EXISTS ci_test;' -U postgres; fi"
+  - sh -c "if [ '$DB' = 'pgsql' | '$DB' = 'pdo/pgsql' ]; then psql -c 'create database ci_test;' -U postgres; fi"
+  - sh -c "if [ '$DB' = 'mysql' | '$DB' = 'pdo/mysql' ]; then mysql -e 'create database IF NOT EXISTS ci_test;'; fi"
 
 script: phpunit --configuration tests/travis/$DB.phpunit.xml