Initial commit.
Moved token into its own file.
Added basic grammar.
Completed basic grammar.
Fixed a typo and cleaned up commented code.
Made tokenize own module.
Made multidigit number tokens.
Added parentheses to tokens.
MAde lparen and rparen terminal tokens.
Made plus/minus and mult/div same priority.
Added parentheses parsing to grammar.
Tokenized negative numbers.
Fixed multiplication to be compatibe with parentheses.
Added basic command line input.
Fixed broken order of operations.
Added README.md
Merged dev into new master