Remove lodash - reduces the size of the lib

[KidkArolis]

Not 100% sure about this one yet. There are 2 other possibilities here:

1. Use native es5 methods to decrease the size further and require old browsers to be polyfilled
2. Use lodash 4 which seems to not bring any overhead either (Use lodash v4 reduxjs/redux#611) (this also requires Add pushState/hashChange support to CherryTree out of the box #1).

[KidkArolis]

Massively might be an overstatement, but the standalone.js bundle goes from 12.82KB down to 8.21KB gzipped.

[KidkArolis]

Switching away from lodash to es5 methods, since babel usage already requires es5 environment (perhaps not the features used in this project, but oh well).

I tried setting up IE8 tests to run on Sauce Labs, but karma, babel, co and other projects were causing issues. I got stuck with getting babel code to execute there, so for now, we'll run the tests on IE9 and up. I've increased the browser matrix to quite a few more browsers including the edge versions of chrome, firefox and ie.

I've removed lodash both from lib code and supporting code, such as tests and config files. The code is simple enough to not warrant the need for lodash. The lib is smaller this way, so that's cool.