[openstack|storage] allow headers to be specified for object manifest

Allows additional headers to be set, as well as overriding the default
X-Object-Manifest header.
[rackspace|storage] allow headers to be specified for object manifest

Allows additional headers to be set, as well as overriding the default
X-Object-Manifest header.
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Merge pull request #1846 from cloudbau/flavor_access

Add API calls to manage flavor access across tenants
Merge pull request #1824 from frodenas/quantum-lbaas

[openstack|network] Add support for OpenStack Networking LBaaS extension
Merge branch 'master' of github.com:fog/fog into example_fix
server.tags implemented
Tag#destroy implemented
Tags#create implemented
shows customizationScript of a VM
VM@customization_script=
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Merge branch 'vcloud/add-metadata' of github.com:restebanez/fog into vcloud/add-metadata
rebase with master
Rename 'each' method to 'each_page'
[Rackspace|Storage] updating large file upload based on @burns suggestions
[rackspace|storage] tweaking upload large file example to use X-Object-Manifest header in anticipation of PR #1855
[AWS|IAM] Added AWS IAM iam.roles support.
Merge pull request #1851 from radekg/master

Added AWS IAM iam.roles support
[rackspace|storage] fixing typo in large file upload documentation; updated large file upload to work with ruby 1.8.7
Merge branch 'master' of github.com:fog/fog into example_fix