Readme: top-level handler exits process!
Exclude log files from npm package
v1.0.0

Breaking:

* Key method on `LastDitch` object is now `go()` instead of `send()`
* Default location for crash.log is the current working directory (instead of inside ./logs/)
* Environment variables changed; now all prefixed with 'THEHELP_'

Other:

* Now use `thehelp-messaging` 1.0.0
* Instead of always appending to log file and sending SMS, move to configurable targets: `stderr`, `crashLog`, `sendSMS`, `sendEmail`. `stderr` and `crashLog` are on by default.
* Now support calling root method (`LastDitch.go`) with two arguments or just one argument and no callback.
* Further bullet-proofing: handle null `err`, missing targets, etc.
* Comprehensive test coverage