stefanbuck/github-linker — pull request #1 by kwakayama (2014-06-16 09:36:54+00:00)
Title: Host check

We need github-linker only on github.
So I added a check if the host is github.
When the tab.url is not a github address, we hide the page action and do
not run the init script.
I also updated the icons and replaced the default icons.