Added release date to CHANGELOG and added pointer to UPGRADING.md

Merge pull request intercity#93 from intercity/jb-changelog

Added a Changelog file

Add supported Ubuntu versions and databases

Update adapter in vagrant file to mysql2

Merge pull request intercity#52 from intercity/postgresql-support

Add Postgres support

Merge pull request intercity#54 from oiuzikov/hotfix/mysql-database-name

Fixed typo in database_name argument

Merge pull request intercity#47 from intercity/passenger-stages

Correctly allow a custom rails_env stage

Merge pull request intercity#40 from bswinnerton/socket_fix

Updating unicorn + nginx socket paths - fixes intercity#39

Update packer basebox template

Add default attributes for nginx server tokens off and mysql bind to …

…127.0.0.1 to roles