WIP: Add projects context

[ghost]

What's in this PR?

• New projects context module
• Updated test units for projects test

Up for dicussion

• Rename lib/code_corps/model to lib/code_corps/schemas ?

TODO (pending discussion)

• [ ] Update all test units in CodeCorps.ProjectTest to use projects context module
• [ ] Update tests unit to use ExMachina
• [ ] Move application logic out of CodeCorps.Project and into context module
• [ ] Update Project controller and other pertinent areas

[ghost]

Note: Do ignore the hard coded attribute in the initial pull :)