Add option for electron-builder

[safu9]

electron-builder uses flat dir structure of icons unlike electron-packager.
I added the option to flatten output structure.
It is disabled by default.

(And, I adjust some indents. If you feel this adjustment unnecessary, no problem to ignore.)

[lazerwalker]

Wanted to bump / put in a vote of confidence for this!

I'm currently flattening my output structure with a few lines of bash in my processing pipeline (https://github.com/lazerwalker/tracery-dot-app/blob/b3f0bf2022faac7560a5accfaee446424d0ae167/package.json#L14) but this is a much nicer solution.

[nklayman]

@safu9 since this isn't getting any attention, why don't you make a separate package (electron-builder-icon-maker) so that we don't have to install from your git repo. Thanks!

[lazerwalker]

Makes sense to me, although it is sad to see this project flounder.

I'm happy to put in the gruntwork of forking + pushing to npm + maintaining if @safu9 doesn't want to. Will probably sit down to do that later this week or early next week if it hasn't happened yet or if @safu9 hasn't chimed in one way or another.

[safu9]

Thanks. I'll do it propably within this week or next week. I'm thinking its new name is electron-icon-builder, more simply.

[safu9]

I just published electron-icon-builder.