Add player class constants and /player command

* /player command (/player name) - returns the given player's race,
gender, class, specialization, level, power level, hp, and max hp (I
constantly see people asking "what level are you", and not to mention
the in-game UI only shows 4 players & their basic information)
* CLASS_NAMES and CLASS_SPECIALIZATIONS constants
Change CLASS_ dictionaries

* Switch to class constants for keys in class names and specializations
* Switch from str.format() to %s
Merge pull request #118 from cs475x/master

Add player class constants and /player command