Encrypt properties on fluo-app.properties and fluo-conn.properties

[blueshift-brasil]

It'll be nice could encrypt some or any property value on fluo-app.properties and fluo-conn.properties.
In this files we can find users and passwords. For a comercial use this is an issue.
The Apache Camel uses Jasypt to encrypt and decrypt property files.

[keith-turner]

It would be nice if this were implemented in such a way that properties stored in zookeeper could also be encrypted. The changes for #893 enabled securing the info in zookeeper with a password, but its not encrypted.

[blueshift-brasil]

I'm working on this.
Considering using the same Apache Camel strategy:
http://www.jasypt.org/encrypting-configuration.html

I'm open to suggestions. ;-)