Changing the E-Mail address always returns "Invalid E-Mail"

When you try to change your E-Mail address like this:

    /email change old@email.com new@email.com

you always get the following error:

    [AuthMe] Invalid Email !

This is the Code causing the issue ([EmailCommand.java](https://github.com/Xephi/AuthMeReloaded/blob/master/src/uk/org/whoami/authme/commands/EmailCommand.java#L110)):

```java
if (args[1] != auth.getEmail()) {
```

It should be changed as follows (as already done in 034f3b5d2e010ad951d412ed15350ee4a66b48a7):

```java
if (!args[1].equals(auth.getEmail())) {
```


This Pull Request also improves the formatting of the passwort recovery E-Mail:
+ Line breaks (\n) are replaced by &lt;br&gt; in the config file so they appear correctly in the E-Mail
+ A date was added to the mailheader to prevent some spamfilters doing nasty things

Edit: Whoops! Sorry for the double ticket. I'm new to Github and I didn't know that createing a Pull Request also generates an issue :/ I'll close #16 in favour of this one.