fix some typos in documents to let new comer can copy and run
add miss plug file description
need use double quote in travis.yml
Merge pull request #258 from hanks/hotfix/document_fix

fix some typos in documents to let new comer can copy and run
Bump version in gh-pages to 2.0.0

It was incremented in the generated Sphinx pages but not the source file
Disable Sphinx html_use_smartypants