Add support for other error_logger reports

[omarkj]

Currently erollbar only deals with crash_reports. It needs to be extended to deal with other reports as well.

The library should also take in a function takes in the report and returns accept or ignore. It will make it possible to squash reports of no interest. It should also be possible to take in a list of atoms, crash_report or error_report which would instruct the library which reports to send.

Since this will introduce the function, I'll deprecate the application and module configuration options.

[omarkj]

Added support for error_messages. This was added as ranch sends them on crash, instead of a regular crash report.