Dev_guide updated with github workflow

I tried to club the information scattered over the
internet,and made it suit to our need.These are the
resources i used:
1. https://help.github.com/articles/fork-a-repo
2. https://help.github.com/articles/using-pull-requests
3. https://help.github.com/articles/set-up-git
4. https://help.github.com/articles/checking-out-pull-requests-locally

Signed-off-by: Pushpesh Sharma <psharma@redhat.com>
Minor Update
Minor update
Minor update
Adding roadmap section to README

With the transition to Swift-on-File, we are attempting
to provide better guidance to the community as to where the
project is headed.

Signed-off-by: Thiago da Silva <thiago@redhat.com>
fixing a few sentences and adding a new url

Signed-off-by: Thiago da Silva <thiago@redhat.com>
Including Thiago's suggestions
Minor Update
Including Prashant's suggestions
Minor update
Fixing example to differentiate between Swift and SoF

Signed-off-by: Thiago da Silva <thiago@redhat.com>
Merge pull request #22 from thiagol11/project_roadmap

Project roadmap
fixed some wording on the example paragraph
Merge pull request #10 from pushpesh/devguide

Dev_guide updated with github workflow
remove reference to fedora 19
adding sentence on consuming existing data

Calling out the fact that with SoF, users would be able to add existing file storage to a swift cluster and expose those files as objects.
Merge pull request #23 from thiagol11/master

adding sentence on consuming existing data