0.2.1! Fixes known crashes, improves code, logging, and adds config opts

_(NOTE: 0.2.1 is the same as 0.2.0, just forgot to bump NPM version.)_

+ New Features:
	- oldDNSMethod config options should can now be specified as strings
	  (and should be!)
	- new oldDNSMethod `NO_OLD_DNS_EVER` prevents resolution in oldDNS
	  even if the blockchain specifies it be done.
	  (see comments in `globals.coffee` for more info and options)
+ Improvements:
	- Improved logging shows file and line number for all warnings
	  and errors (and for some messages of other log levels too)
	- All injected globals now start with 'g' (except for module names)
	- Faster `.bit` resolution
	- Imporved overall code quality and readability
+ Fixes:
	- Fixed #8 (exception on NS timeout)
	- Fixed #9 (return NXDOMAIN on bad 'ns' in *.bit)