Fix some spelling and grammer issues, and offer different tone for the contributing page.
Merge pull request #515 from opscode/btm/contributing

Fix some spelling and grammer issues, and offer different tone for the c...
Start working on the contributors table specs.
Relax feature spec assertions
Test the presence of Supermarket's repositories
Test presence of agreements in contribute section
Tighten scope of contributors feature specs
Merge pull request #522 from opscode/improve_contribute_specs

Improve the feature specs for the Contributors and CCLA parts of the app
Add a note to an unclear Curry spec
Organization contributors are known commit authors

Previously, only users who had signed either an ICLA or a CCLA were
considered known and thus were the only users who Curry considered
"verified." This was incorrect; users who were invited to contribute on
behalf of an Organization are also verified.
Verify a new contributor's Pull Requests.
Rename signed_cla to authorized_to_contribute on Curry::CommitAuthor.
Rename commit author import method names

These new method names reflect a better understanding of the
requirements surrounding which commit authors are authorized to
contribute to projects watched by Supermarket.
Rename commit author import classes for brevity
Create the User#contributor? method.

A user is a contributor if they are a member of one or more
organizations.
Change "not-empty" predicates to "any?"
Make User#username spec deterministic

The previous spec created two Chef OAuth2 accounts, which occassionally
caused spec failures.
Display organization members as contributors.

The implementation of User.all_cla_signers did not account for the fact
that users who are contributors on behalf of an organization are
authorized to contribute to Chef projects. This changes that method to
be User.authorized_contributors, which is all of the users who have
signed the ICLA or the CCLA or are a contributor on behalf of an
organization.
Clarify logic which decides if a user may contribute

A CCLA signature only means that an individual was at one time
authorized to sign CCLAs. As far as Organizations go, all that matters
is whether or not an individual is still considered a member of that
Organization
Revise CCLA copy in the contributors sidebar