Added command line parser

Supported options:
-t: Print Python exception tracebacks into a file (dgamelaunch debugging!)
-c: User configuration file
-u: Player name ;-)
"Time" concept implemented

Each Entity has a set_round_cooldown() method, that, when called,
sets a cooldown. The cooldown is decreased by one each
microround (1/10th of around, so accurately a deciround ;->).

The player is only asked for action when his cooldown is 0,
much like other NPCs, wo are only animated in that specific case.

By not setting the cooldown directly, but by using set_round_cooldown(),
one could implement haste/slow states quite easy.
Fundamental Item management and definition classes

Container base class (for Inventory and piles on the map),
as well as the Item base class and "modifiers" (for wieldable,
or stackable items).
Item class registry and a dummy apple implemented
Very basic item support in Map class; Inventory added to player
Fixed keymapping: jk swapped for player movement
removed ItemComestible base and derive from a parent Comestible instead
Added ItemView and Inventory view in addition to item pickup support
Fixed ItemStackable

The recalculation of the weight was done in __getattr__, but the call is shadowed by regular lookup.

Therefore, we use __getattribute__ and force recalculation.
Create inventory in player class correctly
renamed Game.set_active to Game.set_view
Added hotkey-variable to Item
Fixed Comestible and Apple item classes
Added Map.update()

At the moment, this method only removes empty Item piles.
Called before screen is drawn.
Fixed several issues in item Container class

* Proper detection if input is iterable.
* Do not append item if it is stackable and already in Container
* Remove item from old container
Completed ItemView class, with scrolling and selection support
lol?
Added Item hotkey generation in Container

Container now looks for unused keys and assing them to items prior to adding them.
Merge branch 'item'
Merge pull request #1 from sunkehappy/master

Update README