Added bignum and diffie hellman primitives
Finished wrapper on openssl functionalities
Fixing warnings and linker errors

- QtCreator bug on lib searching, openssl wrappers compilation
depend on libcrypto.a v1.0.1 placed in /usr/local/lib
Added base64 encoding/decoding functionality
Fix on headers and bignum implementation

- Added watchguards to headers
- Separated btwoc conversion from bignum construction
Temporary deactivation of dnsclient functions

Need code revision
Parcial implementation of association request

- Added diffie-hellman key generation
- Added association preference on error messages
Changed association allocation on server

- Changed storage to class manipulated by shared_ptr
Final documentation revision
Merge branch 'master' into provider