Added db creation for travis CI This needs to be done in two seperate

command since postgres does not accept db creation in multiline statement.

.travis.yml

@@ -7,8 +7,10 @@ php:
 
 env:
   - DB=mysql
+  - DB=postgres
 
 before_script:
   - sh -c "if [ '$DB' = 'mysql' ]; then mysql -e 'create database IF NOT EXISTS yiitest;'; fi"
-
+  - sh -c "if [ '$DB' = 'postgres' ]; then psql -c 'drop database if exists yiitest;'; fi"
+  - sh -c "if [ '$DB' = 'postgres' ]; then psql -c 'create database yiitest;'; fi"
 script: phpunit