[openstreetmap-website] Disabled button clarification (#388)

[Saman Bemel-Benrud]

This is a minor pull request to differentiate disabled buttons from secondary buttons. Secondary buttons are light blue, disabled buttons are gray.

Here are two of them side-by-side:

![screen shot 2013-07-29 at 5 55 37 pm](https://f.cloud.github.com/assets/108094/875103/e02d9bd0-f899-11e2-9c28-3dadc86e496c.png)

You can merge this Pull Request by running:

  git pull https://github.com/samanpwbb/openstreetmap-website disabled-button-clarification

Or you can view, comment on it, or merge it online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/388

-- Commit Summary --

  * differentiate between minor and disabled buttons.
  * remove color repetition.

-- File Changes --

    M app/assets/stylesheets/common.css.scss (17)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/388.patch
https://github.com/openstreetmap/openstreetmap-website/pull/388.diff

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