Update typescript to ~2.1.4

[agubler]

Type: feature

Description:

Update typescript dependency to ~2.1.4

Reference Issue: #https://github.com/dojo/meta/issues/124

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 96.05% (diff: 100%)

Merging #30 into master will not change coverage

@@             master        #30   diff @@
==========================================
  Files             2          2          
  Lines            76         76          
  Methods           1          1          
  Messages          0          0          
  Branches         24         24          
==========================================
  Hits             73         73          
  Misses            1          1          
  Partials          2          2          

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