Use @dojo/core/Evented for locale observables.

[mwistrand]

Description:

Migrate from @dojo/compose to @dojo/core/Evented for the locale producer. Also fix a typo in the Intern config.

Resolves #57

Please review this checklist before submitting your PR:

• [x] There is a related issue
• [x] All contributors have signed a CLA
• [x] All code matches the style guide
• [ ] The code passes the CI tests
• [ ] Unit or Functional tests are included in the PR
• [ ] The PR increases or maintains the overall unit test coverage percentage
• [x] The code is ready to be merged

[codecov-io]

Codecov Report

Merging #58 into master will decrease coverage by -0.01%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #58      +/-   ##
==========================================
- Coverage   98.84%   98.84%   -0.01%     
==========================================
  Files          10       10              
  Lines         347      346       -1     
  Branches       46       46              
==========================================
- Hits          343      342       -1     
  Partials        4        4

Impacted Files	Coverage Δ
src/i18n.ts	97.39% <100%> (-0.03%)	:x:

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