Move versioned releases into package subdirectory

This was an error introduced in #1797
Update deps and version constraints for packet and openflow
Add frenetic.2.0.0 release
Update maintainer email address
frenetic: add ocaml version constraint
frenetic: add packet constraint to old versions
frenetic: add ocaml version constraint to old versions
Update email and fix build and remove.
Merge pull request #1859 from msimon/master

[fix] typo in setup.ml, compilation was failling if js_of_ocaml install
Merge pull request #1858 from Chattered/master

Update email and fix build and remove.
Merge pull request #1836 from seliopou/frenetic

Frenetic Release
IOCaml 0.4 server and kernels

This release adds a new server application (removing the requirement for
IPython to be installed at all) and 2 JavaScript kernels
32 bit OCaml compiler on 64 bit host

Compilation options taken from ocaml INSTALL file.

Tested on Ubuntu 13.10 64 bit.

This was modified from the base compiler OPAM spec for 4.01.0 which
includes a patch for MacOSX, though I dont expect MacOSX will work.

The only package I have found which doesn't work (I haven't
tested that many...) is `ssl`.  I believe this is because it uses `gcc`
to compile c stubs but doesn't use `-m32`.  A work around was to
install `ssl` with

```
$ CFLAGS="-m32" opam install ssl
```

Note that ssl uses OcamlMakefile to build and other projects which
use C stubs and OcamlMakefile might have the same problem.
add 'for linux' in descr
Sync latest compiler pull requests
Merge pull request #1862 from bactrian/sync-prs-1396652402

Sync OCaml compiler PRs
Merge pull request #1861 from andrewray/compiler32bit

Compiler32bit
Merge pull request #1860 from andrewray/iocaml

IOCaml 0.4 server and kernels