cmd/faucet, cmd/puppeth: drop GitHub support at official request

cmd/faucet/faucet.go

@@ -437,7 +437,11 @@ func (f *faucet) apiHandler(conn *websocket.Conn) {
 		)
 		switch {
 		case strings.HasPrefix(msg.URL, "https://gist.github.com/"):
-			username, avatar, address, err = authGitHub(msg.URL)
+			if err = sendError(conn, errors.New("GitHub authentication discontinued at the official request of GitHub")); err != nil {
+				log.Warn("Failed to send GitHub deprecation to client", "err", err)
+				return
+			}
+			continue
 		case strings.HasPrefix(msg.URL, "https://twitter.com/"):
 			username, avatar, address, err = authTwitter(msg.URL)
 		case strings.HasPrefix(msg.URL, "https://plus.google.com/"):

cmd/faucet/faucet.html

@@ -80,11 +80,8 @@
 				<div class="row" style="margin-top: 32px;">
 					<div class="col-lg-12">
 						<h3>How does this work?</h3>
-						<p>This Ether faucet is running on the {{.Network}} network. To prevent malicious actors from exhausting all available funds or accumulating enough Ether to mount long running spam attacks, requests are tied to certain common 3rd party accounts. Anyone having a GitHub, Twitter, Google+ or Facebook account may request funds within the permitted limits.</p>
+						<p>This Ether faucet is running on the {{.Network}} network. To prevent malicious actors from exhausting all available funds or accumulating enough Ether to mount long running spam attacks, requests are tied to common 3rd party social network accounts. Anyone having a Twitter, Google+ or Facebook account may request funds within the permitted limits.</p>
 						<dl class="dl-horizontal">
-						  <dt style="width: auto; margin-left: 40px;"><i class="fa fa-github-alt" aria-hidden="true" style="font-size: 36px;"></i></dt>
-							<dd style="margin-left: 88px; margin-bottom: 10px;"></i> To request funds via GitHub, create a <a href="https://gist.github.com/" target="_about:blank">gist</a> with your Ethereum address embedded into the content (the file name doesn't matter).<br/>Copy-paste the gists URL into the above input box and fire away!</dd>
-
 							<dt style="width: auto; margin-left: 40px;"><i class="fa fa-twitter" aria-hidden="true" style="font-size: 36px;"></i></dt>
 							<dd style="margin-left: 88px; margin-bottom: 10px;"></i> To request funds via Twitter, make a <a href="https://twitter.com/intent/tweet?text=Requesting%20faucet%20funds%20into%200x0000000000000000000000000000000000000000%20on%20the%20%23{{.Network}}%20%23Ethereum%20test%20network." target="_about:blank">tweet</a> with your Ethereum address pasted into the contents (surrounding text doesn't matter).<br/>Copy-paste the <a href="https://support.twitter.com/articles/80586" target="_about:blank">tweets URL</a> into the above input box and fire away!</dd>