Merge pull request #215 from adamarla/master

Bringing up to date
Gredits now in two flavours - rewards & paid

Paid gredits are those that are paid for and can be converted to $.
Reward gredits are the system gives but cannot be converted to $.

Paid gredits are used first and then reward ones.
Merge branch 'gredits'
Merge branch 'master' of github.com:abhinavc/web-application
Do NOT call update_attributes as that triggers validations on Account.

We could make the *_gredits columns attr_accessible. But then, we are opening
ourselves to mass-assignment attacks. And as these are 'money' columns, we don't
want anyone changing them willy-nilly.

Use update_attribute instead as that does NOT trigger validations on Account.
Merge branch 'gredits'
Changed the landing page to emphasize mobile app
Merge branch 'gredits'
Minor styling changes to the landing page
Merge branch 'gredits'
Minor edit to landing page title
Merge branch 'gredits'
Minor edits to the landing page
Merge branch 'gredits'
Same tagline for all roles
Addressed rendering difference issues b/w Firefox and Chrome
Merge branch 'gredits'
 minor styling change to tagline
Merge branch 'gredits'
[shot in the dark]: Doing away with size: directive to image_tag

Looks like IE can't render the resulting HTML properly.