Update services.yaml
New exchange: BitBay

Bitcoin and Litecoin exchange
Update howtobuy.php

Hi,

It's a proposition for a correction for this error : 

Notice: Undefined index: content in /home/bitcoinsites/howtobuybitcoins.info/lib/howtobuy.php on line 29
Updating entry
Add expresscoin to services.yaml
Add expresscoin Canada
Update services.yaml

Added HappyCoins label
Merge pull request #85 from rtw/patch-2

Update services.yaml
Merge pull request #86 from mwww/patch-1

New exchange: BitBay
Merge pull request #89 from akmozo/patch-1

Update howtobuy.php
Merge pull request #91 from thejohnha/patch-6

Updating entry Coin Cafe
Merge pull request #95 from HowHai/patch-1

Add expresscoin to services.yaml
Merge pull request #100 from HowHai/patch-2

Add expresscoin Canada
Merge pull request #101 from mvaneijk/patch-1

Update services.yaml
Merged some pull requests manually.
Added new exchange manually from pull request.
Cryptopay update
Merge pull request #103 from georgebasiladze/patch-1

Cryptopay update
Update to entry.
Merge pull request #105 from thejohnha/patch-7

Update to entry.