removed console.info()-s from compiler
doctests
did a more complete implementation of +
web shell: format result as JSON

...temporarily.  We may need to write a proper fomatter later, e.g.
"[1;2;$pinf]" instead of "[1,2,Infinity]"
implemented . (the dot)
parser fix: sequences consist of exprs, not values
package.json: added "glob" to devDependencies
Compiled coffee files should go in a directory separate from dist
Add testing infrastructure
Merge with changes in master