create unit tested utils for our code

Rather than add another dependency when we feel we are missing a lodash or es6 feature simple util can be written. Obviously if performance/time is a concern we can require from elsewhere but if needs are small we can rely on them provided unit tested
- [x] values - function to get back array of values for an object in a given order
- [x] except - function to shallow copy and remove keys from an object (equivalent to using rest)
- [x] shallowCopy - function to get a shallowCopy of an object (equivalent to spread)