Merge pull request #76 from drywall/feature/sidebars

Code for creating custom sidebars and then selecting one on a given post...
update 404.php to use the new sidebar formatting
rename has_gravatar function to largo_has_gravatar

and update largo-author-box.php
start refining the content templates

putting the extra byline stuff into largo_byline() instead or directly
in the template files
Merge pull request #77 from drywall/feature/sidebars

Changing custom sidebar behavior
adding a content template for search results
style the search results
cleaning up the plugins init, loading custom plugins from github instead of including them with the theme
don't force activation of the contact form plugin
add a FULL_WIDTH constant for images and use constants in the various image functions
use 'stories' instead of 'posts' for consistency with other templates