check
added predicates signatures to most of the classes of the parser.
2 of them implemented: Const,Variables
added predicates for IfThen and IfThenElse
and re arranged the classes in tag parser
combined the predicates of IfThenElse and IfThen together.
also created a constructor for the IfThenElse (that deals with both cases)
created a process function that deals with actual parsing, this function currently
 supports constants,variables, IfThenElse
corrected process syntax
corrected process syntax2
process is online. currently supporting if statements, consts (excluding quated)
and variables. done some basic tests. more are welcome
now quated expressions are recognized also, without the print of quated constants
now quated expressions are recognized also, without the print of quated constants
repaired the issue with the quate expressions in the reader (the singleton)
also added full support for the constanst.
Merge pull request #1 from amitaid/zelig

Zelig