Add a `corebuild` script to Core which wraps ocamlbuild with all
the recommended options for building Core core from the command-line.

Signed-off-by: Yaron Minsky <yminsky@janestreet.com>
Signed-off-by: Anil Madhavapeddy <anil@recoil.org>
Merge branch 'master' into add-corebuild
core: disable errors-for-warnings by default
core 109.34.00-rc1
Merge remote branch 'mirage/add-corebuild' into core-109.34.00
add corebuild to core-109.34.00
core 109.34.00-rc2
add core_kernel dependency to pa_test
core 109.34.00
Merge pull request #897 from janestreet/core-109.34.00

core 109.34.00-rc1
Added package for Blahcaml 2.1
Added Abella 2.0.0
Fixing ocaml version constraint for Abella 2.0.0 per feedback
Merge pull request #905 from chaudhuri/abella-2.0.0

Added Abella 2.0.0
Added Profound 0.4.2
Merge pull request #906 from chaudhuri/profound.0.4.2

Added Profound 0.4.2
Merge pull request #904 from darioteixeira/master

Added package for Blahcaml 2.1
Add sonet 0.1.2.
Merge pull request #908 from pmundkur/master

Add sonet 0.1.2.
Add odisco 0.1.2.