Update release notes and gem with migration notes

Squashed commit of the following:

commit 61e3faa4d73d01ed6c9c9c96a71ec2876239f899
Author: Gaute Hope <eg@gaute.vetsj.com>
Date:   Wed Aug 14 17:20:49 2013 +0200

    better wording

commit b8a3c4e3f239082d352214cb7b81c6059f92961d
Author: Gaute Hope <eg@gaute.vetsj.com>
Date:   Wed Aug 14 17:19:31 2013 +0200

    0.14 ready

commit 6db678048a5c185320cc7fd3abb11f810404fe6e
Author: Gaute Hope <eg@gaute.vetsj.com>
Date:   Wed Aug 14 17:18:11 2013 +0200

    link to wiki page

commit 63fc961e1e75e0020180fc179522bb77cb363956
Author: Gaute Hope <eg@gaute.vetsj.com>
Date:   Wed Aug 14 16:47:23 2013 +0200

    WIP: rel-notes