Pull request with some new features and improvements

[hablutzel1]

Some notes on the proposed changeset:

• Commit messages are still referencing issues created on https://github.com/hablutzel1/cryptoapplet/issues, what would be the best thing to do here?, to include full links?, to migrate these issues?, to take them out of the commit messages?
• New 'uji-dist' Maven module is currently creating a distribution only for PDF signature, but I could change it to allow to configure the desired distribution by using Maven profiles (e.g. for CMS signature or a combination of several formats).
• There are long comments inline in the code explaining some code snippets, maybe it is not up to your coding standards, just let me know and I can take that out before the pull request gets applied.

I'll keep awaiting for your comments on this pull request to improve what is required.

[borillo]

Hi @hablutzel1 :)

It would be great if you can migrate the issues here. I just activated the issue section a few days ago.

It will be difficult to review the whole pull-request with all the modifications mixed togeher, but i will try to discuss each point here in order to complete de integration.