Update webpack to the latest version 🚀

[greenkeeper]

Version 3.1.0 of webpack just got published.

Dependency	webpack
Current Version	2.6.1
Type	devDependency

The version 3.1.0 is not covered by your current version range.

Without accepting this pull request your project will work just like it did before. There might be a bunch of new features, fixes and perf improvements that the maintainers worked on for you though.

I recommend you look into these changes and try to get onto the latest version of webpack.
Given that you have a decent test suite, a passing build is a strong indicator that you can take advantage of these changes by merging the proposed change into your project. Otherwise this branch is a great starting point for you to work on the update.

---

Release Notes

v3.1.0

Features:

• Allow different library names for UMD
• Support for passing a defined identifier as this in a IIFE
• Use the new resolve performance option cacheWithContext: false by default when it's safe
• Support array of functions as configuration
• add sortModules to Chunk which is required in extract-text-plugin to support webpack 3

Bugfixes:

• ! with truthy webpack identifier will evaluate correctly
• assets and dependencies are preserved in concatenated modules
• Fix some internal usage of deprecated APIs

Commits

The new version differs by 271 commits.

• 4bb3018 3.1.0
• 7e757cd Merge pull request #5194 from webpack/feature/hoist_regex_literals
• 2879fb3 Merge pull request #5225 from hulkish/feature/added-chunk-sortModules-method
• 5f08aa4 removed default params for node 4
• cadf9f7 added sortModules method to Chunk class
• 70b7d2f fix(sp): spelling mistake in const name
• 0ab36c4 Merge pull request #5196 from AndersDJohnson/multi-compiler-functions
• 2eccb19 Merge pull request #5081 from KTruong888/4099_es6_refactor_lib_hot_module_replacement_plugin
• e365b2e Merge pull request #5210 from ematipico/master
• 7913789 Merge pull request #5220 from liuyuanyangscript/master
• 15becbd README.md bugfix
• 2ccc1fd Changed statement 'var' to 'const'
• a589a6c Merge pull request #5183 from kahwee/patch-1
• c2fa5d4 feat(perf): remove unneded regexp escape
• 987a9f3 feat(perf): hoist final regexp

There are 250 commits in total.

See the full diff

Not sure how things should work exactly?

There is a collection of frequently asked questions and of course you may always ask my humans.

---

Your Greenkeeper Bot 🌴

[codecov-io]

Codecov Report

Merging #302 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #302   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          42     42           
  Lines         285    285           
  Branches       55     55           
=====================================
  Hits          285    285

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 41301eb...c074042. Read the comment docs.

[diegohaz]

#287