Add libraries
Add option page to be authorized by GitHub
Update ignore rules
Replace localStorage to chrome.storage.local

localStorage isn't shared between contents_script.js and options page
without background.html. chrome.storage.local can be shared between them.
Make contents_script to use GitHub API token

...that acquired in the options page.
Change indentation from spaces to tab

to follow the convention.
Remove the handler which is revoking the API token

GitHub /authorizations APIs are only accessible via HTTP basic auth.
So if you want to revoke a token, the password of the token owner is needed.
WTF.
Update options.html
Show the options page if there is no GitHub API token.
Merge pull request #1 from Kroisse/master

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