Merge branch 'master' into working
* master:
rename topics/week7__95__combinatory__95__evaluator.mdwn to topics/week7_combinatory_evaluator.mdwn
light editing, rename functions for clarity
rename topics/week7_eval_combinatory.mdwn to topics/week7__95__combinatory__95__evaluator.mdwn
rename eval_combinatory
post combinatory evaluator
post eval_combinatory
rename topics/week7_eval_cl.mdwn to topics/week7_eval_combinatory.mdwn
add Plexy and some stubs/reorganization
link to Plexy
rename topics/_week6_plexy.mdwn to topics/week6_plexy.mdwn
update