Mighty GitHub PRs

Restyle Pull Request screen for easier navigation and more focused review sessions.

This is an extension to restyle Pull Request screen for easier navigation and more focused review sessions in GitHub (public or any private/enterprise edition). Main features: - works on corporate enterprise domains, you just need to enable in the context menu of the extension in Chrome toolbar: - shows file tree on the left hand side - folders are collapsible - folders are as concise as possible (if a folder containing on single folder it is merged with parent in visualization) - deleted files are red and crossed through in file tree - seen files become non-highlighted once seen - only one single file's diff is shown if a file is selected from the tree - large, visible Approve and Needs work buttons added ('Need work' button automatically adds a generic 'Please fix review items' comment.) - clutter is reduced - elements on the top of the page is eliminated in the file navigation view to eliminate visual noise