Improved docs.
Merge branch 'master' of github.com:manix84/time-pilot into modularisation

* 'master' of github.com:manix84/time-pilot:
Updating bullet factory with correct values required, and adding bullet module.
Adding getCount and getData methods to the bullet and enemy factories.
Replacing internal bullets with bullet factory.
Creating constants module.
Merge branch 'modularisation'

* modularisation:
  Creating constants module.
  Replacing internal bullets with bullet factory.
  Adding getCount and getData methods to the bullet and enemy factories.
  Updating bullet factory with correct values required, and adding bullet module.
  Improved docs.