Escape regexp on checking email availability; change type of input to email

packages/rocketchat-lib/server/functions/checkEmailAvailability.coffee

 RocketChat.checkEmailAvailability = (email) ->
-	return not Meteor.users.findOne({ "emails.address": { $regex : new RegExp("^" + s.trim(email) + "$", "i") } })
+	return not Meteor.users.findOne({ "emails.address": { $regex : new RegExp("^" + s.trim(s.escapeRegExp(email)) + "$", "i") } })

packages/rocketchat-ui-account/account/accountProfile.html

@@ -29,9 +29,9 @@
 						<label for="email">{{_ "E-mail"}}</label>
 						<div>
 						{{#if allowEmailChange}}
-							<input type="text" name="email" id="email" placeholder="{{email}}" />
+							<input type="email" name="email" id="email" placeholder="{{email}}" />
 						{{else}}
-							<input type="text" name="email" id="email" placeholder="{{email}}" disabled="disabled" title="{{emailChangeDisabled}}" />
+							<input type="email" name="email" id="email" placeholder="{{email}}" disabled="disabled" title="{{emailChangeDisabled}}" />
 						{{/if}}
 						</div>
 					</div>

packages/rocketchat-ui-admin/admin/users/adminUserEdit.html

@@ -15,7 +15,7 @@
 				</div>
 				<div class="input-line">
 					<label for="email">{{_ "E-mail"}}</label>
-					<input type="text" id="email" autocomplete="off" value="{{email}}">
+					<input type="email" id="email" autocomplete="off" value="{{email}}">
 				</div>
 				{{#if hasPermission 'edit-other-user-password'}}
 				<div class="input-line">