Commits on Feb 11, 2016

1. tools: add recommended linting rules …

   This change adds ESLint rules that meet two criteria:
   
   * recommended by ESLint
   * require no code changes
   
   These rules are:
   
   * `no-func-assign`: Disallow overwriting a function that was written
   as a function declaration.
   * `no-negated-in-lhs`: Disallow negated left operand of `in` operator.
   It prevents `if(!a in b)` when `if(!(a in b))` is intended.
   * `no-obj-calls`: Disallow global object function calls. It prevents
   errors like `JSON()` and `Math()`.
   to exercise the code in tests or whatever, it can sneak in.
   * `use-isnan`: Prevents errors like `if (foo == NaN)`
   * `no-octal`: Disallows confusing constructs like `var num = 071;`
   * `no-delete-var`: Delete works on properties, not variables. Disallows
   `delete foo`.

   

   Trott committed Feb 11, 2016
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