Now implements the ScriptRunner interface, and was defined the eval method
The variable class, this class gets the name and the value of a formula variable
Test Class of Formula evaluate execution
Test Data Builder object for the Variable Class
now with isValid method
now with isValid tests
Exception throw when expression is not valid
Add getExpressionVariables method
Add equals method to Variable
More test behaviors add
Fixed problems with no BigDecimal numbers on expression
remove the trash used for test of class