Add some details in the INSTALL file

Little documentation update

Give two supported compilers, as examples

Document the new optional libbotan dependency

Add the libuuid dependency to the INSTALL file

Upgrade to C++14

Little updates to the README and INSTALL files

s/optionnal/optional/

Document the systemd-daemon optional dependency

Build the man page as part of the build process, if ronn is found

Remove cryptopp dependency, directly include a simple sha1 implementation

Document the bare-JID-for-IRC-users feature

Add some documentation