- move utilities from tests.js to test_utils.js
- added hooks class + tests
- Added hooks to JSEP + tests for their arbitrary usage
- Moved Ternary to a plugin. Default JSEP still includes ternary support.

- switch from `this.node` to local method object `env.node`
- make after-all hook use env.node instead of nodes
- Update readme

add lint rule for tabs
update all spaces to tabs to pass lint

# Conflicts:
#	rollup.config.js
#	src/jsep.js
#	test/tests.js

- add Jsep.hooksAdd() shortcut to Jsep.hooks.add()
- pre-compute the calls to all registered hooks, binding to this from the constructor. Wrap the object-handling of the node argument into the hooks and return the result. This changes `Jsep.hooks.run('name', { context: this, node: {} })` to `updatedNode = this['name'](node)'`
- remove `before-all` and `after-all` hooks
- updated tsd.d.ts (including spacing)

- Remove pre-compute optimization, but add local method this.runHook(name, node). This will check if there is a hook to run before calling hooks.run() in order to save time. Performance is around 89% of the code without hooks (but without the optimization was around 67% - mostly due to making the { context: this, node } object)