Remove use of `grey` from templates

This is a long standing issue where the `grey` color from the `colors`
package is invisible in some terminal color schemes, most notably
Solarized Dark.

The changeset also replaces `console.log()` with
`process.stdout.write()` in the main `bower` bin file. This is because
some of the mustache templates didn't have a new line at the end of the
file (something that most editors will automatically insert). Now they
all consistently have an EOF new line. But `console.log()` adds a
trailing new line, so switch to `process.stdout.write()`.
Merge pull request #299 from twitter/remove-grey-color

Remove use of `grey` from templates