feat: Upgrade to lodash 4.0.0

[testower]

Closes #1812

[testower]

Seems like karma-coverage's lodash also needs to be upgraded? _.contains is removed in favor of _.includes in lodash 4.0.0, and upping the version in karma, forces karma-coverage to use it as well.

31 01 2016 21:47:22.042:WARN [preprocess]: Can not load "coverage"!
  TypeError: _.contains is not a function
  at createCoveragePreprocessor (/Users/testower/Developer/karma/integration-tests/coverage-coffee/node_modules/karma-coverage/lib/preprocessor.js:54:10)
  at Array.invoke (/Users/testower/Developer/karma/integration-tests/coverage-coffee/node_modules/karma/node_modules/di/lib/injector.js:75:15)
  at [object Object].get (/Users/testower/Developer/karma/integration-tests/coverage-coffee/node_modules/karma/node_modules/di/lib/injector.js:48:43)
  at instantiatePreprocessor (/Users/testower/Developer/karma/integration-tests/coverage-coffee/node_modules/karma/lib/preprocessor.js:52:20)
  at Array.forEach (native)
  at /Users/testower/Developer/karma/integration-tests/coverage-coffee/node_modules/karma/lib/preprocessor.js:68:21
  at Array.forEach (native)
  at createPreprocessor (/Users/testower/Developer/karma/integration-tests/coverage-coffee/node_modules/karma/lib/preprocessor.js:67:12)
  at Array.invoke (/Users/testower/Developer/karma/integration-tests/coverage-coffee/node_modules/karma/node_modules/di/lib/injector.js:75:15)
  at get (/Users/testower/Developer/karma/integration-tests/coverage-coffee/node_modules/karma/node_modules/di/lib/injector.js:48:43)
  at /Users/testower/Developer/karma/integration-tests/coverage-coffee/node_modules/karma/node_modules/di/lib/injector.js:71:14
  at Array.map (native)
  at [object Object].invoke (/Users/testower/Developer/karma/integration-tests/coverage-coffee/node_modules/karma/node_modules/di/lib/injector.js:70:31)
  at [object Object].Server.start (/Users/testower/Developer/karma/integration-tests/coverage-coffee/node_modules/karma/lib/server.js:95:18)
  at Object.exports.run (/Users/testower/Developer/karma/integration-tests/coverage-coffee/node_modules/karma/lib/cli.js:246:26)
  at Object.<anonymous> (/Users/testower/Developer/karma/integration-tests/coverage-coffee/node_modules/karma/bin/karma:3:23)
  at Module._compile (module.js:434:26)
  at Object.Module._extensions..js (module.js:452:10)
  at Module.load (module.js:355:32)
  at Function.Module._load (module.js:310:12)
  at Function.Module.runMain (module.js:475:10)
  at startup (node.js:117:18)
  at node.js:951:3

[dignifiedquire]

The problem is that karma exposes helper._ which is lodash, so some plugins rely on this, so we need to check all plugins (and this will be a breaking change)

[dignifiedquire]

I have thought about it a little bit more and I think I want for the next major release to drop helper._ so that I don't run into this issue anymore. It's pretty easy to upgrade, just need to make sure to release new versions of all the different plugins that rely on it.