Initial commit
Implemented IParse interface
Added AbstractNode class
Implemented various operators
Added Database class to store schema information (may not be useful)
Added Entity class
Initial commit of NodeVisitor
Renamed operator files and updated Operator class
Replaced Operator class with TokenClass and implemented Tokenizer
Reokaced TokenKeywork with TokenRelation
Removed IExpression interface
Partial implementation of reduce() function
Reimplemented TokenKeyword
Using TokenKeyword for initial parse and identification of Relations
Implemented first-level parse where tokens that are part of a relation are reduced to the relation itself
Added new constructor to TokenRelation to enable first-level parse
Started implementation of second level parse
Need to compute postfix/prefix notation and form parse tree
Converted reduced infix expression to postfix
Need to create the parse tree
Added comments to various classes
Final commit before break