an initial commit of self-signed certificates

reconfigure cmake and set ENABLE_SELFSIGNED

needs openssl and probably works only on linux (since the script is in bash)
added the CMakeLists.txt
reworked certificate generation, UaExpert still misses revocatio lists etc, but creating a full CA will be to complex ATM
Merge pull request #123 from acplt/self-signed

Self signed
no base64.h needed anymore
Merge branch 'master' into noglobal

Conflicts:
	src/server/ua_services_discovery.c