stdin support and path resolving

Adjusted view/stylus/static assets path to be relative to bin/nodestalgia (allows to run via ./bin/nodestalgia or ./index.js)
Added stdin support (for example: ssh user@host -o Ciphers=arcfour tail -f /var/log/apache2/access.log | node index.js -)
Added carrier dependency for stdin support
Set executable bit for bin/nodestalgia

Notes: stdin can be interrupted by EOF on log rotation.