CP-467 Add copy:ts task to be used during test runs

[maxwellpeterson-wf]

Description

This copies the .ts files into the buildSrc directory during test runs so that typescript sourcemaps work when debugging test.

It will only run this task if the typescript language is chosen.

Testing

When using this branch of wGulp with a typescript project (like wSession)... you should see typescript files in ./build/src/ after running gulp test

FYA:
@trentgrover-wf
@evanweible-wf

[rmconsole-wf]

    When this pull is merged I will use the following information:
    Version: wGulp 0.8.1
    Release Ticket: CP-461

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Last updated on Tuesday, March 10 10:56 AM CST

[evanweible-wf]

+1

[trentgrover-wf]

+1
@jayudey-wf ready for merge

[jayudey-wf]

QA Resource Approval: +10

• Testing instruction
• Dev +1's
• Dev/QA +10 with detail of what was tested
  • installed version of wGulp and verified that TS files located in build folder as expected
• Unit test created/updated
• All unit tests pass

Merging into master.