remove other files [ci-skip]
update format
rename filename [ci-skip]
Add some figures
rtgui: update the outline and add the drafts of subsection{1,2}
Merge pull request #4 from grissiom/rtgui

rtgui: update the outline and add the drafts of subsection{1,2}
Update README.md
Add rake task for gh-pages branching
Merge pull request #5 from rogerz/master

Generate HTML and publish to Github pages
Update README.md

Give example on how to contribute
fix bug of html generate, command displayed only but not executed
update html file name
add apt-get update to travis-ci
remove env as it will leak GITHUB_TOKEN
Merge pull request #6 from rogerz/patch-1

Update README.md
Merge pull request #7 from rogerz/html

fix bug of html generate, command displayed only but not executed
Merge pull request #8 from rogerz/travis-ci

Fix travis-ci building error and security issue
Update 13-chapter_lwip.md
Update 13-chapter_lwip.md
Update README.md [ci skip]