Defaulting postgresql user to postgres, to match Travis' expectations…

…. And adding PG database to Travis setup script.

.travis.yml

@@ -7,3 +7,4 @@ branches:
     - rails3
 before_script:
   - "mysql -e 'create database thinking_sphinx;' > /dev/null"
+  - "psql -c 'create database thinking_sphinx;' -U postgres >/dev/null"

lib/cucumber/thinking_sphinx/internal_world.rb

@@ -18,7 +18,7 @@ def initialize
 
         @adapter  = (ENV['DATABASE'] || 'mysql').gsub /^mysql$/, 'mysql2'
         @database = 'thinking_sphinx'
-        @username = 'root'
+        @username = @adapter[/mysql/] ? 'root' : 'postgres'
         # @password = 'thinking_sphinx'
         @host     = 'localhost'
       end