Remove dependency on tslint and grunt-tslint

[agubler]

Type: feature

The following has been addressed in the PR:

• [x] There is a related issue
• [x] All code matches the style guide
• [x] Unit or Functional tests are included in the PR

Description:

Remove explicit dependency on tslint and grunt-tslint as this is now provided by grunt-dojo2. Also cleans up rules that are not compatible with tslint 4+ in preparation for the dependency update in grunt-dojo2.

Will fail until https://github.com/dojo/grunt-dojo2/pull/121 has been merged and version 2.0.0-beta.36 is released

Related to https://github.com/dojo/meta/issues/159

[codecov[bot]]

Codecov Report

Merging #73 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #73   +/-   ##
=======================================
  Coverage   98.91%   98.91%           
=======================================
  Files          11       11           
  Lines         367      367           
  Branches       48       48           
=======================================
  Hits          363      363           
  Partials        4        4

Impacted Files	Coverage Δ
src/unit.ts	100% <ø> (ø)	:arrow_up:
src/date.ts	100% <ø> (ø)	:arrow_up:
src/number.ts	100% <ø> (ø)	:arrow_up:

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