AC: see list of posts on homepage
AC: list includes post title
AC: list includes post author name

- T: add username to users
- T: username is required
AC: list includes date published

used Story#created_at since we don't have a published_on date
S: post title is link to read post
AC: posts listed in reverse chronological order

- T: installed Timecop
cleanup: improve bootstrapification of devise forms
AC: clicking link allows post to be read

- T: add better_errors gem
Merge pull request #6 from BM5k/stories/6017

S: As a Guest ISBAT read posts