PWA startup for linux with >1 chrome profile (#40)

[brdloush]

Possible fix for #40

I had to change get-app-id-* functions to return [app-id profile] instead of just app-id, because the profile name (such as Profile 1, Profile 2, Default) must be passed as --profile-directory to google-chrome binary when running the PWA version.

In my case, following values are returned:

(get-app-id-profile "portal")
;; => ["gbilcjcjkenedpcbagempggobciaddcp" "Profile 1"]

I have no idea how osx handles profiles, so I didn't touch the osx code and nil is returned as profile. That results in --profile-directory flag not being added. Hope I didn't break anything here.

[djblue]

Thanks for the PR @brdloush! It looks good, just have a few small comments. Should be good to merge after.