RESTEASY-982 Moved the signed.txt files under target.

Removed the signed txt files, and then updated the unit tests so that
the files are created and read from the target folder.  Now, a mvn
clean will remove them and they don't always appear as a modified file
when you look to commit changes.
Merge pull request #411 from awhitford/RESTEASY-982-Fix

RESTEASY-982 Moved the signed.txt files under target.