Refactor internals

Api Changes

• removed condition in emitters
• replaced event with stamp
• removed behaviour where updates would always get batched till after a complete update was done
  • same result can be achieved by using vstamp.on(stamp)
• removed multiple arguments in attach
• renamed .val to .compute()
• removed property emitter
• removed non-generic error emitter
• moved storage and is to a their own repo

Performance

• emit 150x
• instances 20x
• compute 35x
• operators 20x

Features

• Added object operators
• Added $condition operator