Update systemjs-builder to version 0.15.16 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

systemjs-builder just published its new version 0.15.16, which is not covered by your current version range.

If this pull request passes your tests you can publish your software with the latest version of systemjs-builder – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging :palm_tree:

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The new version differs by 474 commits .

• 25de88a 0.15.16
• 47e90dc fix tests
• 21b7238 ensure compile is cacheless
• e56d05e fix sourcemaps expectations
• 85b5c67 fix node 6 tests
• e11f79e node 6 testing
• 8554509 support comments, cache fixes
• ae5a649 fix esm source maps by switching to internal Babel transform
• f44d0f3 fix rollup sourcemaps output paths
• 641f59d Merge pull request #565 from asapach/master
• e1bfeb5 fixed sourcemaps tests
• 548879c rollup optimization to exclude entry points optimized out
• ad17437 update minified templates
• 375fd64 uin?
• 789a66e windows test fix

There are 250 commits in total. See the full diff.

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