Add an endOfLine option to the console transport

[aquavitae]

It would sometimes be useful to be able to customise the EOL character used by the Console transport. My use case is where I want to log a task as started, then add a check once it's completed. Setting endOfLine to '' would allow this:

log.info('Running task... ');
doTask();
log.info('done\n');

An alternative would be to allow setting the end-of-line character per log (e.g. log.info('Running task...', {eol: ''})), but I don't see a sane way of doing that while allowing string interpolation.

[indexzero]

Let's rename this eol to be consistent with the file transport

[indexzero]

Cherry-picked into 2.x. Thanks!