chore: gulp-typescript v3 detects typescript version

[devversion]

• In gulp-typescript ~3.0.0 the typescript will be no longer included as a dependency.

This means that it now automatically detects the current installed typescript version.

See http://dev.ivogabe.com/gulp-typescript-3/ - Follow-up to #2456 (comment)

[jelbourn]

LGTM

[devversion]

@jelbourn Nearly instant reviewed (~30 sec)

[jelbourn]

@devversion why are you still awake?

[devversion]

@jelbourn Ehm, I was working on a presentation for school next week (and this is my good-night PR) 😄

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