Support for resolving wallet address using DNS

During last week, we have implemented querying wallet addresses using TXT records of the e-mail domain. To register a mapping, domain holder must add TXT record using name where "@" in e-mail address is replaced by "." and the contents of the TXT record are the wallet address prefixed with "talleo:". This allows other cryptocurrencies to also use similar query method without causing conflict if the address prefixes are similar.

We also improved e-mail address validation to allow "-" in domain names and using IPv4 address if the e-mail host doesn't have domain name registered. Mapping wallet addresses using e-mail address containing IPv4 address of the e-mail host is not possible and will not be implemented.