Merge pull request #1087 from jordansissel/prep14

Prep14
Use gnu sed's '-i' flag style. FreeBSD/OSX's sed usage is different.

Since we generally build release on Linux platforms (for jenkins, etc),
let's move back to gnu sed.
- More cleanup in prepare
- copy all packages/etc into the right place
Bam, beta 1
Build flatjar as well
Update changelog through e9810a64f70d3acd920d612c0e2597588bbdb057
Update links from flatjar to tar.gz
Merge pull request #1089 from jordansissel/link-to-tarball

Link to tarball