Implemented single quote operator

This consumes a token just like the double quote operator,
but without consuming any following whitespace
PEG ruleset and source file are now determined by cmdline args
Fixes not returning from recurse on toplevel rule

Before, if we recursed onto the toplevel rule from anywhere in the
code, and then that arbitrarily deep (in the recursion) version of
the toplevel rule were to finish, execution would finish as opposed
to returning from that recurse on the toplevel rule. This is
probably fixed by this commit
Changed example set to be more reflective of expressive power
Merge branch 'cmdArgs' into newFeatureSetMerge
Merge branch 'fixRecursion' into newFeatureSetMerge
Put debug prints into debug blocks
Merge branch 'fixRecursion' into newFeatureSetMerge