Add reCaptcha as default implementation

Add support for enabling and disabling captcha

wise-webapp/src/main/webapp/WEB-INF/app.properties

@@ -44,6 +44,7 @@ database.password=
 #------------------------
 # GMAIL SMTP Configuration
 #------------------------
+mail.smtp.socketFactory.class=javax.net.ssl.SSLSocketFactory
 mail.smtp.socketFactory.port=587
 mail.smtp.auth = true
 mail.host=smtp.gmail.com
@@ -54,19 +55,28 @@ mail.smtp.starttls.enable=true
 #------------------------
 # Domain address
 #------------------------
-
 mail.registrationEmail=root@localhost
 mail.siteEmail=root@localhost
 
+##################################################################################
+# Users Registration  Configuration
+##################################################################################
+
+# Enable/Disable user registration confirmation by e-mail. If it's enabled, mail must be configured.
+registration.email.enabled = false
+
+# Enable captcha confirmation
+registration.recaptcha.enabled = false
+
+# ReCaptcha is the default captcha. Public and private keys are required.
+# More Info: http://www.google.com/recaptcha
+registration.recaptcha.privateKey =
+registration.recaptcha.publicKey =
 
 ##################################################################################
 # Site configuration
 ##################################################################################
 
-# Enable/Disable user registration confirmation by e-mail. If it's enabled, mail must be configured.
-user.confirm.registration=false
-
 # Site administration user. This user will have special permissions for operations such as removing users, set password
 # etc.
 admin.user = admin@wisemapping.org
-