Implemented quoting and started evaluation
Also fixed a typo in cxrs.sh that was causing a compilation error
in cxrs.h
Started implementing variables/enviroments
Implemented set_car and set_cdr
Also slightly modified Makefile and .gitignore to change the name of the resulting excecutable from Bootstrap to bootstrap.
Implemented define (simple form) and variables. No set! yet, though.
Also deleted vm.c as I have decided my code won't run under a vm but rather will be compiled into C.