Configure SSL certificate of the production server.

@lordoftheflies is already working on this.

Since Aug 23, 2016.

### Configuration

```
mail.host=box.topflavon.net
mail.port=587
mail.from=admin@topflavon.net
mail.pass=qwe123
mail.organization=TopFlavon Team
mail.application=TopFlavon
mail.logo=https://www.topflavon.net/images/favicon-96x96.png
```
### Test results:

```
-------------------------------------------------------------------------------
Test set: com.dd.mlm.topn.auth.service.VelocityEmailSenderIntegrationTest
-------------------------------------------------------------------------------
Tests run: 2, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 5.094 sec <<< FAILURE! - in com.dd.mlm.topn.auth.service.VelocityEmailSenderIntegrationTest
testSendRegistrationActivationEmail(com.dd.mlm.topn.auth.service.VelocityEmailSenderIntegrationTest) Time elapsed: 1.19 sec <<< ERROR!
org.springframework.mail.MailSendException: Mail server connection failed; nested exception is javax.mail.MessagingException: Could not convert socket to TLS;
nested exception is:
java.io.IOException: Server is not trusted: box.topflavon.net. Failed messages: javax.mail.MessagingException: Could not convert socket to TLS;
nested exception is:
java.io.IOException: Server is not trusted: box.topflavon.net
at com.sun.mail.util.SocketFetcher.configureSSLSocket(SocketFetcher.java:613)
at com.sun.mail.util.SocketFetcher.startTLS(SocketFetcher.java:525)
at com.sun.mail.smtp.SMTPTransport.startTLS(SMTPTransport.java:2041)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:711)
at javax.mail.Service.connect(Service.java:366)
at org.springframework.mail.javamail.JavaMailSenderImpl.connectTransport(JavaMailSenderImpl.java:501)
at org.springframework.mail.javamail.JavaMailSenderImpl.doSend(JavaMailSenderImpl.java:421)
at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:345)
at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:362)
at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:350)
at com.dd.mlm.topn.auth.service.VelocityEmailSender.send(VelocityEmailSender.java:81)
at com.dd.mlm.topn.auth.service.VelocityEmailSender.sendRegistrationActivationEmail(VelocityEmailSender.java:112)
at com.dd.mlm.topn.auth.service.VelocityEmailSenderIntegrationTest.testSendRegistrationActivationEmail(VelocityEmailSenderIntegrationTest.java:67)

```