Merge pull request #2 from aw1231/master

Added zero to initial counting example
steps towards packaging a cli for low-level language
add very simple repl
add -c 'cmd' to commandline tool, and complete vocab
support chapters in javascript
better error message on line failure
random change from / to | in syntax, both accepted for now
primer reference had become inconsistent
stop calling all programs 'cosmicos'
skip tail recursion
move chapter list into cmake proper
add parse of statements to index.json
record origin of Parse.hx nesting in parse
last step of adding parsed code into index.json
make sure skipped evaluations do not get forgotten
tweak beginning of message
deal correctly with bigints in parse
update help message for cosmsg
prepare for new manuscript style
advertise text rendering option