modified image sources
Add logic for item pickup
Refactor to generic item class

Item class can be used with multiple possible items
Update book size, cleanup comments
Randomize book location
Change water to wood

Will be used for placing items later in game
Reset enemies when player reaches top of game area
Add comments to app.js
Modify game board from 5 to 7 columns
Add pause functionality
Drop carried item if hit by bug
Enemy rate increase upon player success
Cleaned up images directory
Convert top row to scoring row

Five positions for player to place book into, and logic to handle
placing books into open slots.
Merge branch 'master' into gh-pages
Setup end game status

Remove enemies and items, reset player position
Increase number of enemies on player success
Fix code bug with book update when not carried
Fix code bug where book placed when not carried
Add enemies in reverse later in game