Merge pull request #1 from adowns01/tree-model

set up basic tree model
Merge pull request #2 from adowns01/tree-model

moved files to correct place, now tree model is the correct one
button on screen ages tree
tree-view now listened for when the tree changes and renders
view is now linked to DOM
view updates dom with age, height, and num oranges values
Merge pull request #3 from adowns01/tree-view

created Tree view
added image to DOM that updates with age of tree
seperate the view and model to different files
Merge pull request #4 from adowns01/tree-view

reorganized tree-view
added a constants object so the basic logic could be changed easily
Merge pull request #5 from adowns01/constants

added a constants object so the basic logic could be changed easily
added death logic to tree model
added constants for tree's magic numbers