When loading logs to parse, the first two lines should be the regular expressions

The log format should be:
```
log-parse regex
multi-exec regex
log line1
log line2
...
```
Currently, you have to input the regexes manually, which makes log-portability problematic.

This will have to be added to the documentation. See #156 and #161

[Issue created by grahamstl: 2017-05-01]