Fix broken links in README.md

- Corrected href to "the blog extension guide"
- Corrected image src and href for Travis CI build status
Merge pull request #92 from kevinthompson/patch-1

Fix broken links in README.md
All symbols all the time
Updated blog docs link in README
Merge pull request #96 from johnrees/patch-1

Updated blog docs link in README
Revert "All symbols all the time"

This reverts commit 13345ecff8053e7e072c8e8b239b53f32a566bcd.
Generate summary based on the completely rendered article
Implement HTML-aware summary creation
Update templates to use link_to, omit paragraph around markdown
Emit timestamp in articles in the time zone specified in config.rb. Fixes #94
Merge pull request #100 from bhollis/master

Reform how we generate blog article summaries
Merge remote-tracking branch 'upstream/master'

Conflicts:
	lib/middleman-blog/blog_article.rb
	middleman-blog.gemspec