Mix of --<option> and -<option>

[dveeden]

The output of gh-ost --help shows short options like -database in go-style.
However gh-ost without options shows 2016-08-03 09:16:34 FATAL --database must be provided and database name must not be empty with --database instead.

Let's settle for the go-style one-dash options instead of the GNU style long options.
This prevents the later use Unix style short options, but that should be fine

[shlomi-noach]

Oh I'm so ambivalent about this. While I realize this is a golang project, I really do like adhering to unix-style --long-options.

Given that

The output of gh-ost --help shows short options like -database in go-style

it makes sense to approve #128, but... I'd like to see if we can have it otherwise.

[zmoazeni]

This really confused me using the --help. Personally I'm in favor of using the double dash since that's a bit more standard. But I don't have a strong preference.

However, having documentation+help consistent would be a great.

[zmoazeni]

it makes sense to approve #128, but... I'd like to see if we can have it otherwise.

Does this mean you'd prefer the opposite of 128? As in, instead of changing the documentation, change the output of --help to double dash?

I can take a stab at that PR if so.