WIP: adding variables to symbol table
remove unncessary output & improve compiler test errors
vastly simplify semantic checking with symbol table
add tests for new semantic checking
refactor SAST datatypes
typed variables in the SAST!
cover all statement cases
add printf support and more tests
refactor for clarity
update compiler README and clean
add WC to travis
Merge pull request #63 from rapid-lang/symbols

Variables everywhere!