chore(gitignore): add .idea to gitignore

[jelbourn]

Add /.idea to the .gitignore under a section "IDEs and editors". Without this, WebStorm WebStorm / IntelliJ will keep prompting you if you want to add project files to git and also show them as "unrevisioned files" in the "Local changes" view.

[cironunes]

lgtm

[Brocco]

@jelbourn I have no issues with adding as it can be helpful for many... but an FYI, when I was using WebStorm I added .idea to my global .gitignore so I never had to worry about it (http://stackoverflow.com/questions/7335420/global-git-ignore)

[jelbourn]

Yep, a global config is good for things like this, but it doesn't hurt to have it anyway.

[filipesilva]

@jelbourn can you rebase onto master before I merge it?

[jelbourn]

@filipesilva done

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