In this commit I've made the following modifications:

* Added a thief.gif image to test as a hero tile
* Created sub divs in table data fields and changed the IDs to be for these divs rather than table cells.
  This allowed me to expand the cells to be the same size as the tile image. (didn't work using height and width properties of TD tag)
* Killed vertical scroll on div as well as body of page
deleted a useless file
Fixed screen dimensions, character movement limits and added grass tiles.
Changed png extention to uppercase as was causing issues for linux case sensitive server
work in progress
Refactored the code a little, created a constant for background tiles