Merge pull request #5 from marlonandrade/master

Adjusting to use env var for database user
Merge pull request #6 from marlonandrade/master

Updating remote url repository
Merge remote-tracking branch 'upstream/master'
Merge pull request #7 from marlonandrade/master

Adding environment var for database host
Removing puma config vars

they were almost equal the default ones
Merge remote-tracking branch 'upstream/master'