Gentoo version bump to 1.4.0

Please note that this is not only a version bump...

I removed the recently added options for DNSCRYPT_PROVIDER_KEY, DNSCRYPT_PROVIDER_NAME and DNSCRYPT_PROVIDER_ADDRESS because I think these are deprecated by the new resolver list file. If this is wrong please tell me so. I couldn't find any reference on these options on dnscrypt.org anymore, so I guess this is accurate.

I also set the default resolver to OpenDNS since this was the default before, this should probably be noted in a info message in the ebuild (these are shown to the user after the install is complete). Also, it may make sense to add the resolver list option to the conf.d and init.d files so the user may override the default providers.

Apart from that I also noticed that the commit that changed the init script for the options mentioned before didn't update the Manifest with the new checksum. I'm not sure because I didn't test that, but I fear this would usually break the ebuilds since portage won't merge the ebuild when it notices that the checksums differ.