Hi,

We would like to have support for some open & free holiday API for retrieving non-US holidays (e.g. holidayapi.com, which was one of first Google results or similar) or possibility to customise it in config file.

Reason for that is holidays in each country are different, so chaos monkey killing stuff also on german (in our case) holidays, which is not the thing most people want. For now, without thinking about it a lot, I would say, loading from config file would be better if we want to have monkey disabled on days which are not official holidays, but when most people are not working anyway.

@ebukoski, what do you think about it? We will take care of implementation if you're ok with merging PR with such feature.