Provide a toggle button to switch between HTML output and AsciiDoc source

Resolves #2
Remove unused bootstrap.css
Update AsciiDoc.js to Asciidoctor in the title and the repository URL (asciidoctor org)
Use #BA3925 color for the icon
Update to version 0.2.1
Update jQuery to 1.10.2
Print error message when something went wrong during renderer

Resolves #3
resolves #6 process files with .asc file extension
Merge pull request #7 from mojavelinux/issue-6

resolves #6 process files with .asc file extension
Add live reload feature

Resolves #8
Add beautiful icons!
Add usage and changelog section
The stylesheet reference is appended to the DOM on each refresh

Resolves #9
Preserve <script> in the body and detect LiveReload.js to avoid multiple refreshes

Resolves #8
Add highlight.js for syntax highlighting

Ref #11
Add context menu to send the "browser content" to the Asciidoctor Editor
Version 0.2.4
Add configuration option for specifying custom attributes

Resolves #10
Resolves #14, Allow to change the theme of AsciiDoc HTML output
Version 0.2.5