Add ship attr_accessor and can be hit test
Added hit method and accessor and added is not hit on initializing test
Set hit status to be false on initialize and add knows its coordinates test
Added raise error if no coordinates argument and completed first version of Cell class
Add raise error if trying to put a ship into a full cell and add cannot be hit more than once test
Added method ensure that cell cannot be hit more than once and added contexts to tests
Amended Cell class to test for water on initializing
Rethink
Update README.md
Merge branch 'development' of github.com:shanhasan/Battle-Ships into cell

Incorperating development branch changes into cell branch.