Abstracts node path imports to system/path

Reorganizes local git support to exclude from web
Swaps sha1 usages to md5 to avoid needing sha1 on the web (md5 is required by Gravatar)
Avoids crypto-browserfy and imports md5.js directly
Uses platform crypto for random nonce strings

Adds anti-trojan-source eslint rule
Improves typescript config for eslint import

Removing the find widget allows iframe rendering

Contributors view will now show commits from the upstream, if one exists
Adds new contributors view options
 - Sorting options
 - Option to show all branches

Fixes issues with editor.id no longer being available

Adds repo change events for rebase, merge, and cherry-pick
Clears some caches only when specific change occurs