* FIX: handling with Money objects in CurrencyCart and CurrencyCondition

* add some sum calculations to the cart
* FIX: use accidently quantity in Item::priceWithConditions()
* FIX: return Money instead of int in CurrencyCart::totalTaxAmount
* require 0.1.13 MOneyDatatype

* change condition calcuation behaviour - return only their calculation, not added to the item amount
* add Condition attribute "quantity_undepended" to calculate the condition only once per item, not multiply with the quantity
* some code simplicfications

* add LaravelLocale if \Config exists
* add CurrencyCondition for Conditions with MoneyObj

* add CurrencyCartServiceProvider
* change the calculation-princip of the currencyItems

* optimize and add some tests and documentation for autocompletition

* change the namespace

* make item_rules customizable (preparing for own CartClass with additional custom item fields)