Allow search prefix of bundle or charm.

Allow search prefix of bundle or charm.

Limit searching to bundles or charms by using a prefix
such as:
     bundle:mysql
     charm:mysql

or their plurals:
     bundles:mysql
     charms:mysql

now featuring whitespace agnosticism:
     bundles:  mysql
       charms: mysql

https://code.launchpad.net/~bac/charmworld/improve-bundle-search/+merge/207290

(do not edit description out of merge proposal)

[bac, 2014-02-19 19:50:58]

Please take a look.

[j.c.sackett, 2014-02-19 21:18:39]

On 2014/02/19 19:50:58, bac wrote:
> Please take a look.

LGTM, thanks Brad.