Update src/lexer.js

String Token RegExp added
Update src/lexer.js

Fixed STRING regular expression (quote forgotten)
Update src/lexer.js

STRING regex optimized (capture group has been removed)
Added strings and numbers to the grammar.

Will complie, but the repl doesn't like it.
Repl accepts objects with strings or numbers as keys.
Cleaned up.
Minor grammar.
Added stdio to help and alphabetized.
Added browser option to help.
Factored out flag processing.
Moved prologue into repl.
Stdio flag can take browser/bare flag.
Added shebang to grammar.
Tests for objects.
Type test for objects with string/number keys.
Standardized object string key type representation.
Conditional object wrapping to clean up raw js output.
Upgrade to unicode-categories 0.9.1
Merge remote-tracking branch 'joneshf/issue-109'
Merge remote-tracking branch 'joneshf/issue-164'