Update webpack to version 1.12.13 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

webpack just published its new version 1.12.13, 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 37 commits .

• 668a5f0 1.12.13
• 68b94fb fixed merging mistake
• 7279c4e fixed #1650
• c0aebd6 beautify
• af348cd fixed #1650
• c0420f1 1.12.12
• 74f0d13 Merge pull request #1909 from antigremlin/fix-shortener-backslashes
• 9818c37 Merge pull request #1844 from leftstick/webpack-1
• ab43388 1.12.11
• abfec13 Revert "Fix unsafeCache default option"
• 88c2c09 Add a hook for adding script attributes
• 66142f2 1.12.10
• 581bfca added manual context map option to ContextReplacementPlugin
• 069d156 ignore electron as keyword in electron target
• 59b3979 Fix Windows filename backslash incompatibility

There are 37 commits in total. See the full diff.

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