Rename
Refactoring
Refactoring
Added Lambda Expression parser (simple form, ex: "(\ (x y) x)" )
Added Lambda Expression parser (complex form, ex: "(\ (x y) (x y)" )
Added Variables parser
Refactoring
Merge branch 'Chapter7'

* Chapter7:
  Refactoring
  Added Variables parser
  Added Lambda Expression parser (complex form, ex: "(\ (x y) (x y)" )
  Added Lambda Expression parser (simple form, ex: "(\ (x y) x)" )
  Refactoring
  Refactoring
  Rename