#63 - Added support for dynamic properties

Added tracking/creating inovcations for dynamic properties
The contribution based on the Tobias Krantzer's blog post - https://tobias-kraentzer.de/2013/05/15/dynamic-properties-in-objective-c/ and code - https://github.com/anagromataf/DynamicProperties
added macro MKTStubProperty (with stubProperty shorthand) to stub properties that can be used with sort descriptors, predicates etc
Merge pull request #72 from zats/master

Added macro to stub properties that work with sort descriptors, predicates etc
Modify stubProperty implementation & tests
Simplify KVO example
Merge pull request #69 from emartynov/master

Added support for dynamic properties