dan/ken:
* guest can add comment
* comments are appended to sources#show's comment_list
* AJAXified! <3
ken/dan:
* guest can click on source title on Sources#show
* new tab is opened with the source.url
dan/ken: comments are ordered by updated_at (DESC) when rendering sources#show
ken/dan: new comments are prepended to top of comments-list
dan/ken: remove comments and whitespace
Merge pull request #12 from danbender/show-comments

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