[chef] omnitruck and install.sh release

[Lamont Granquist < >]

Earlier today we released a new install.sh script with a few fixes.

- support for -d <directory> option needed by vagrant-cachier (https://github.com/fgrehm/vagrant-cachier/issues/13)
- the patch to add -d also appears to have fixed linux mint installs as a side effect (cleaner code is cleaner)
- added a -P server option to install the OSS server instead of the chef-client, eg:

curl -L https://www.opscode.com/chef/install.sh | bash -s -- -P server

that works on ubuntu and redhat/centos -- fedora, oracle, amazon still have issues with CHEF-3838

- changed sles 10 and opensuse 11 to download the el5 binary which might fix them (i'd like to know if it does: CHEF-4892)
- a few tweaks to error handling and suppressing stderr output