Reload server config from settings file during server startup.
Fixed #130: Improve connecting to IRC over SSL

- Allow specifying DEFAULT ca_file, private_key_file, cert_file paths in app/private directory
- Allow specifying custom ca_file, private_key_file, cert_file paths for a server in app/private directory

This fix resolves issues with connecting to OFTC IRC server over SSL.
Merge pull request #138 from waartaa/fix_oftc_ssl

Fixed SSL connection issue with OFTC IRC Server