Move secure module declaration from application.conf to dependencies.yml

Attempting to run on play-1.2.5.3 gave the error:
```  
Compilation error (In /app/controllers/Check.java around line 10)
The file /app/controllers/Check.java could not be compiled. Error raised is : The type Check is already defined
```
It had also first issued the warning:
```
WARN  ~ Declaring modules in application.conf is deprecated. Use dependencies.yml instead (module.secure)
```
So, I put the `secure` module declaration into `dependencies.yml` and all is well.