Small Content Update 1

Fixed a few small bugs/inconsistencies. Added several new items. Added merchant/store (yellow character in town). Added ability to sell items for gold. Added a new enemy, and a new boss (boss appears on floor 25/50/100). Changed dexterity to grant % crit chance bonus instead of damage, fixed player never critting, changed crit damage popup to be orange to make it clear when critting. Added life regen, mana regen, crit chance bonus to stats page.  Added several new items (sold by merchant/dropped by enemies)