Fixed libsodium-0.4.2.ebuild

- src_configure() missed econf
- path of ChangeLog was wrong
Added dnscrypt-proxy-1.3.3.ebuild

- bumped dnscrypt-proxy to 1.3.3
- fixed wrong digests in Manifest
- removed old ebuilds which don't have official packages anymore
Merge pull request #17 from Strayer/gentoo-fix-ebuilds

Fix Gentoo ebuilds