add 6.7.3-ee packages

doc/install/packages.md

 # GitLab EE Omnibus packages
 
 We have started to create [gitlab-omnibus packages](https://gitlab.com/gitlab-org/omnibus-gitlab/blob/master/README.md) for GitLab Enterprise Edition.
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 Update instructions can be found at https://gitlab.com/gitlab-org/omnibus-gitlab/blob/master/doc/update.md .
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 Some GitLab features are currently missing from these packages (MySQL, HTTPS, SMTP support) and we currently only have packages for Ubuntu 12.04 64-bit and Enterprise Linux 6 64-bit.
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 Please contact subscribers@gitlab.com for more information.
 
 ## GitLab 6.7 Enterprise Edition
+- Ubuntu 12.04 64-bit [gitlab_6.7.3-ee.omnibus.1-1.ubuntu.12.04_amd64.deb](https://s3-eu-west-1.amazonaws.com/downloads-packages/43c6dec1146d6335c6ca90fa8679d4e63962732e/gitlab_6.7.3-ee.omnibus.1-1.ubuntu.12.04_amd64.deb)
+    - MD5: 527561c7b817f3375598778368530e9a
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+- Enterprise Linux 6 64-bit [gitlab-6.7.3_ee.omnibus.1-1.el6.x86_64.rpm](https://s3-eu-west-1.amazonaws.com/downloads-packages/4a83046ae506fe84158c1bc433d8fa85a886abba/gitlab-6.7.3_ee.omnibus.1-1.el6.x86_64.rpm)
+    - MD5: 6335719321acc8edc2f718570960c832
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+## Previous versions
 
 - Ubuntu 12.04 64-bit [gitlab_6.7.2-ee.omnibus.2-1.ubuntu.12.04_amd64.deb](https://s3-eu-west-1.amazonaws.com/downloads-packages/91692a0c3730d22621af07670b832e3ec1df7ee9/gitlab_6.7.2-ee.omnibus.2-1.ubuntu.12.04_amd64.deb)
 MD5: 1deb3ac65cb2f25b00b489e52bf800e6
 - Enterprise Linux 6 64-bit [gitlab-6.7.2_ee.omnibus.2-1.el6.x86_64.rpm](https://s3-eu-west-1.amazonaws.com/downloads-packages/e13ccafca35955ad754ea501798875d99e0cce4c/gitlab-6.7.2_ee.omnibus.2-1.el6.x86_64.rpm)
 MD5: 36347c81013c4215226a3cb30f6ac1b4
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-## Previous versions
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 - Ubuntu 12.04 64-bit [gitlab_6.7.2-ee.omnibus-1.ubuntu.12.04_amd64.deb](https://s3-eu-west-1.amazonaws.com/downloads-packages/66e5962a62e403f30b63a6a709a894fdf6f8bc33/gitlab_6.7.2-ee.omnibus-1.ubuntu.12.04_amd64.deb)
 MD5: 24d9618767217acd39c37cb7e0ae1881
 - Ubuntu 12.04 64-bit [gitlab_6.7.1-ee.omnibus-1.ubuntu.12.04_amd64.deb](https://s3-eu-west-1.amazonaws.com/downloads-packages/6d24b1dfb3a0ac4c80a7301bd42a32faf1e9d650/gitlab_6.7.1-ee.omnibus-1.ubuntu.12.04_amd64.deb)