INT-1319: Add less compile cache:

[durran]

Precompiles less before check, run, start and in prepublish.

Combined the jade template compilation and less compilation into a
single compile ui script.

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This change is

[durran]

https://evergreen.mongodb.com/patch/56f4118c3ff1223d40001333

[kangas]

1. What impact does "strict: 0" have? I don't understand what that value means in this context.
   • http://eslint.org/docs/user-guide/configuring#configuring-rules
   • http://eslint.org/docs/rules/strict
2. It looks like you're overriding this rule: https://github.com/mongodb-js/eslint-config/blob/master/rules/strict-mode.js. Should we discuss making this part of our default config?

[durran]

I think we should - strict mode prevents us from writing invalid Javascript and IMO should be our standard.

[kangas]

I'm in favor of using strict mode, too. However, what precisely does "strict": 0 do above? As far as I can tell, you disabled the eslint "strict" rule entirely.

See also Lucas' comment in the rule you're overriding:
https://github.com/mongodb-js/eslint-config/blob/master/rules/strict-mode.js

    // `'use strict';` is a job for transform tools
    // and using it explictly will break them.

[kangas]

TODO:

• Doesn't work in release builds. (I think that's why you labeled this DNM 😃 )
• Please update the postuninstall (aka "clean") script to purge the new cache directory
• Please rewrite the ES6 code as ES5. Else, let's have a larger discussion about committing to ES6. :)

Otherwise -- hooray! 🎉 This significantly improves application load time, as we expected.

[kangas]

LGTM