Refactoring of CA to be able to handle renewals * encode and/or sign request separately from uploading the blob * move signing from CertificateStore to CA implementation since it's CA-specific anyway * adapt LocalCA and TestCA (DutchGridCA pending) * add FileUtils.writeFile
branches/nl.nikhef.jgridstart-flyingsaucer/nl.nikhef.jgridstart/src/nl/nikhef/jgridstart/CertificatePair.java