Added rule for items that appreciate in quality

Currently only Aged Brie maps to this rule
Will remove dead code from DoEverythingRule in next commit to better
illustrate how it was detected.
Removed dead code relating to Aged Brie

1) Run EclEmma
2) Delete dead code
3) Let infinitest tell you everthing worked swimmingly
4) Rerun EclEmma to check for more dead code