Implement support for the ICU message format.

[mwistrand]

Type: feature

Description:

Implement CLDR data loading, as well as ICU message formatting with Globalize.js.

Related Issue: #21

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
• [x] The code passes the CI tests
• [x] Unit or Functional tests are included in the PR
• [x] The PR increases or maintains the overall unit test coverage percentage
• [x] The code is ready to be merged

[codecov-io]

Current coverage is 98.64% (diff: 98.54%)

Merging #26 into master will increase coverage by 0.14%

@@             master        #26   diff @@
==========================================
  Files             2          5     +3   
  Lines           133        221    +88   
  Methods           1          1          
  Messages          0          0          
  Branches         26         37    +11   
==========================================
+ Hits            131        218    +87   
  Misses            1          1          
- Partials          1          2     +1   

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