Add summary plugin

- Set summary end for pelican-static-blog post
Post on building pelican with Travis CI

- Add intro and themes section
Add git commands for theme
Add plugins section
Deploy to S3. Small edits
Remove title. It's added by Pelican
Spell check
Last lot of edits

- Spelling
- Add end summary
Ignore devserve pid files
Merge branch 'post/continuous-blog'