add support for parsing require statements

[ruxkor]

squash commit:

• only load files matching /.js/i
• parse files for require statements and include modules accordingly

commits:

• 2313720 changed to red color for non-string require stmt
• 0409596 path name generation fixed
• 2d8da34 added note to readme about require parsing
• ac3476b intelligent parsing of require statements
• 3caa82d typo
• cf8353d read() only file if it matches /\.js/i

[rauchg]

Please check out 0.4.0. I prefer passing a list of files instead of doing static analysis. If you want to do static analysis, create a different command that finds filenames according to requires and use them in conjunction.