Remove /build doc content with .gitignore & remove from the gitub repo

[Ruiub3i]

Creates a lot of problems having to solve Merges with builds which are irrelevant

The goal is to remove /build to .gitignore & remove from "master"

But the /build should be always done whenever anyone uses bepro-js, so on the "npm i" command

[mariuseliassen]

We should also remove the ".DS_Store" file in root and subfolders.

[nodexchange]

This might be related:
#60

[riaje]

@Ruiub3i
Seem to be fix by the work of @moshmage in this pull request, check but normally you can close it
(see the part "Deals with" in the PR)

#47