Make diff generation lazy #98
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This factors out two
Diffclasses:LocalFileDiffandGitHubDiff. These have the ability to generate diff information on demand. For example,GitHubDiffonly pulls down files from GitHub when you view them in the web UI. This makes startup dramatically faster.This cleans up a lot of code—the JSON objects that are passed from server to client are all generated in
diff.pynow, rather than in bits and pieces throughout the codebase.Fixes #60
Fixes #68
Fixes #90
See #97