Logdissect

Fixed
- Bug with single-digit months in `now`/`nodate` datestamp converters

Added
- `post_parse_action` parser method for more customization
- `emerge` parser for gentoo emerge logs

Fixed
- Bug parsing gzipped files

Fixed
- Reversed UTC time calculation bug

Updated
- Renamed `date_format` parser attribute to `format_regex` for clarity

Fixed
- `linejson` parser bug

Added
- Cisco IOS parser
- Windows rsyslog agent parser
- Web access log parser
- `utils` functions
- API documentation for filters, outputs, utils

Fixed
- Python3 --list-parsers error

Updated
- Data is now stored in dicts instead of custom objects
- `log_source` attribute replaces old `source_host` for logs
- Parser logic is more modular
- Parsers can now use any fields
- Moved `morphers` to `filters`

Fixed
- Syslog parsers now ignore lines without stamp
- Daylight savings check logic