Added new Message type SignatureMessage for sending the Signature.
First compiling version of SignatureMessage.

Currently not using any exception handling, and the key is read in PKCS8 format.
Added reading of pem files using the bouncycastle PEM reader.\
Added signing to the .jsp pages. Now to actually make it run.
PEMReader.getObject() returns PrivateKey, not KeyPair. Hardcoded path to server key currently, will put this into the crossbear properties file.
- Added a proerty file location in the root of the crossbear webapp directory (fourfourthree/)
- Added a configuration option to specify the path of the private key in the properties file (privatekey.path)
- Signature is now working.
- Added ant build script to root directory of fourfourthree server
- Added postgres jdbc jar to lib directory, since it's not installed everywhere by default