Added a link to the Hatetepe project.

See: https://github.com/lgierth/hatetepe/commit/9f62e314492e33eee8d07b3523815ae131ea21fa
Added a link to the jStorage project (closes #24).

See: https://github.com/unlicense/unlicense.org/issues/24
Added a link to the Epoch project (closes #23).

See: https://github.com/unlicense/unlicense.org/issues/23
Updated the link to the UN project (closes #20).

See: https://github.com/unlicense/unlicense.org/issues/20
Added links to the tkpip and tkrequest projects (closes #19).

See: https://github.com/unlicense/unlicense.org/issues/19