Switch from gcc to gcc-c++ to support ruby gems that use g++ for native
extensions
Merge pull request #24 from jwforres/update_ruby_extended_pkgs

Switch from gcc to gcc-c++ to support ruby gems that use g++ for native
Collapse extended into the base centos-ruby image...
Without some of the packages currently being installed by extended,
any gem that requires native extensions will fail the bundle install.
Moving extended into the main image so that the main image covers
the 80% use case.

Also fixing puma startup, since we are running the server from the
APP_ROOT already, puma doesn't need it specified in the conf.
Merge pull request #25 from jwforres/collapse_extended_ruby_to_base

Collapse extended into the base centos-ruby image...
Change url for sti
Merge pull request #26 from pmorie/url

Change url for sti
Add the centos-mongodb example
Merge pull request #27 from jwforres/centos_mongodb

Add the centos-mongodb example
Added 'centos-ruby-builder' image with self-contained app builder
Merge pull request #23 from mfojtik/self-contained-builder

[WIP] Added self-contained Ruby builder image
Revert changes to centos-ruby and update prepare script to allow for different rails environments.
Merge pull request #28 from jwforres/ruby_prepare_script_environments

Revert changes to centos-ruby and update prepare script to allow for dif...
Typo in prepare script for centos-ruby
Merge pull request #29 from jwforres/fix_typo_centos_ruby

Typo in prepare script for centos-ruby
Remove 'chmod' step from Dockerfile and add correct perms to bin files
Refactor centos-ruby-* images to avoid code duplication
Copy /usr/bin/{prepare,run,save-artifacts} from /opt/ruby/bin
Merge pull request #31 from mfojtik/centos-base-tweaks

Refactoring of the centos-ruby-* images to share code and avoid duplication