Added first classes
Replaced names, new interfaces, new methods, some javadoc
first full commit: classes completed and javadoc
fixed a NullPointerException
changed methods from ZestConditionalElement to ZestExpression
Modified some Hereditariety
Some refractoring and completed expression classes.
Added method isTrue in ZestConditional
Deleted ZestConditionalElement.java
Added ZestStructuredCondition class and corrected inheritance
Fixed compilation problems in ZestPrinter
Added uml folder and uml diagram
Added png
modified ZestConditional.deepCopy() AND ZestAssertion.deepCopy()
Reoved code duplication
Modified ZestPrinter to support complex conditional
Removed isRoot()/setRoot(), added methods to remove children expression
Corrected classes ZestExpressionResponseTime & ZestExpressionStatusCode
All current tests passed
Added some tests for class ZestStructuredExpression. All passed