Merge pull request #2 from wjzijderveld/fixes

Namespace fix
move taxonomy from taxonomy library
Merge branch 'master' of github.com:iampersistent/VespolinaCore
namespace fix
namespace fixes
fix namespace in test
typo
namespace fix
updates to properties
remove redundant properties
initial commit of PricingElement
add interfaces for proccesing and getting the processed value
add interface to PricingContext for the quantity of items
tests for updates in interface
Merge pull request #17 from iampersistent/pricing

updates to pricing interfaces and additional tests