Inventory Tooltip

Thanks to the combined efforts of @niamu and myself hawkthorne now had a working tooltip for the player's inventory!
![screen shot 2014-07-07 at 8 48 07 am](https://cloud.githubusercontent.com/assets/4028391/3495343/5bdc0a98-05d5-11e4-82e1-dea92dd9953e.png)
This addresses #1722 and #1959
To make the tooltip useful it displays pertinent stats about the selected item as well as a small description.  To improve readability of the tooltip, colored text has been implemented using the Tasty Text library (https://github.com/markandgo/text.lua).  Crafting results can also read by the tooltip before they are added to the inventory.  The tooltip is opened with the jump key.