Extend built-in methods

[Dan Levy]

Extend built-in methods:

• clamp - helps ensure an input number is within an upper & lower limit.
• cloneDeep - give rules control over input mutation.
• hash functions
• Currency functions (Ideally use dinero.js)
  • dinero.add
  • dinero.subtract
  • dinero.multiply
  • dinero.allocate
  • Pre-defined formatter helpers
  • Accumulate changes between dinero calls via toSnapshot