Be more strict with JSHint.
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Description

Be more strict with JSHint.

Summary: Add a bunch of extra checks to be performed by jshint. For documentation, see http://jshint.com/docs/options/.

Test Plan:
Ran jshint --config support/jshint/jshintconfig webroot/rsrc/js/. There were a bunch of existing violations, but some of these are legitimate and probably require attention.

{
  "bitwise": true, // 0 violations
  "curly": true, // 0 violations
  "immed": true, // 1 violation
  "indent": 2, // 0 violations
  "latedef": true, // 10 violations
  "newcap": true, // 1 violation
  "noarg": true, // 0 violations
  "quotmark": "single", // 55 violations
  "undef": true, // 24 violations
  "unused": true, // 107 violations

  "expr": true,
  "loopfunc": true,
  "sub": true,

  "globals": {
    "JX": false,
    "__DEV__": false
  },
  "browser": true
}