Update webpack to version 1.12.5 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

webpack just published its new version 1.12.5, 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 webpack – 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 6 commits .

• 3266bbc 1.12.5
• 6b60662 performance improvement
• c1b097e Merge pull request #1619 from IngwiePhoenix/patch-1
• 76f4f0b Run away from buggy UglifyJS 2.5.0
• 530f669 1.12.4
• 8d10b22 force relative path for "module" require

See the full diff.

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