Update systemjs-builder to version 0.15.17 🚀

[greenkeeperio-bot]

Hello 👋

🚀🚀🚀

systemjs-builder just published its new version 0.15.17, 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 🌴

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The new version differs by 29 commits .

• b6c5e3d 0.15.17
• f8d8563 System.register metadata.deps support note
• 3378663 recursive map config fix
• 61d7540 fetch default hook to include caching
• 8316062 rollup sourcemaps sources correction, handle sanitization entirely in loader
• 1a25fd0 Merge pull request #568 from asapach/master
• 1228897 added support for input source maps
• 5dae1e9 update source maps expectations
• 6ba5476 source maps debugging
• a4fd3ec template minification
• 5c56ef1 Merge pull request #595 from joeldenning/jspm-1793
• f5ae32a Only copying default property of commonjs modules once onto esModule.
• d667134 Merge pull request #586 from NTag/master
• 009ecf9 conditional build corrections
• 550e22c consistent staticBuild defaultExport option and detection

There are 29 commits in total. See the full diff.

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