Widen Readmes and clean for comment box index on commit code view

[MaximusMcCann]

[tmlee]

@mccannmax thanks for your commits it looks like some of the div on github has changed that has cause this extension to break. I could fix that once i merge this in. What is div.file-box targeting? The file explorer?

[MaximusMcCann]

When just viewing files on github, say, in the commit history.

[tmlee]

@mccannmax I had a problem with some of the comment box appearing on top of the widen code view. I just pushed a new commit applying a new css rule on the #js-repo-pjax-container instead. Would you give it a try to see if it does what you intended since .file-box falls under #js-repo-pjax-container?

[MaximusMcCann]

@tmlee had some issues when toggling the plugin and having github not go back to normal. my fork master has what works for me. only point: my way just floats the important code pieces on top to widen it. aka things get hidden behind and are unusable until toggled off. Cheers.