Make --force/-F work for exports

[PragTob]

The --force/-F options do not work for local exports, from the code I'm not totally sure they work for publish as the code seems to quit before that.

I know that most of the sense here is to have it be valid by the schema, but with dates having to specify a day (jsonresume/resume-schema/#142) and dates that can not be left out for current, this simply isn't feasible for me.

For people with the same problem, try commenting out this line: https://github.com/jsonresume/resume-cli/blob/master/lib/waterfallArray.js#L73

I was thinking about fixing up a PR, but with the force option only available on program and that not being available in the waterfall scope (from what I can tell) that seems like some work. Happy to cook up a PR if good advice flies in.

[mchelen]

Want to test this PR and see if it works? #62

[mchelen]

Should be fixed by #62