Fixing a crash when An empty array was in the parameter list
Initial plan tests
Inserting belief tests
Plan tests

Okay, this last three commits were just to turns the project back to
passing in Drone.IO.
For some reason I do not accept this "X=1+1 && K=X/2."

To make the grammar accept the expression above, I changed the order
of the math_expression and conditional_expression. Now, the last has
more priority. I do not know if I'm right.
setTail do not need receive line

I'm starting to review the parsers class and some test. For this
light start, I'm changing just the parser array class to not have
line on setTail.
TriggerEvent: changing order of parms in constructor to make a standard
EventType: changing order of parms in constructor to make a standard
Functor: changing order of parms in constructor to make a standard
ConstantExpression: standardizes parms' order in constructor
StackedSymbol: useless line data in constructor
StackedSymbol: useless line in push method
Parameter: removing useless parm

Maybe this class will be erased in future because do not add
new behaviour.
Action: removing useless parm

Maybe this will be erased in future because do not add a new behaviour.
Array: removing useless data
Symbol: removing add function from here

Because just Expression uses the add function, I am removing it from
Symbol class.
Symbol: fixing tests

Fixing the wrong line code wrote in checked file...