Improved SSH instructions. Changed brooklyn version. (Update Script Miss.)

Conflicts:

	docs/use/guide/quickstart/index.md
Added missing  <!-- BROOKLYN_VERSION -->s

Conflicts:

	docs/use/guide/quickstart/catalog.xml
	docs/use/guide/quickstart/index.md
Added missing {{ site.url }} to download.md.
Updated versions.md to reflect release of 0.5.0.
Upped (c) year to 2013.
Added information/command to populate local repository.
Typos.
Added information about semantic versioning.

Conflicts:

	docs/meta/versions.md
Fix global-web-fabric/index.html for CloudFoundry refs

- Remove CloudFoundry setup instructions, and instead
  just reference https://github.com/cloudsoft/brooklyn-cloudfoundry
Added user = ubuntu for all AWS locations (using U 12.04 LTS AMIs).
Tried aws-ec2.user = root, but this global parameter did not propigate.
documented support for securityGroups, keyPair and loginUser.privateKeyFile
added support for LOGIN_USER_PRIVATE_KEY_FILE
Merge pull request #758 from jdtoy/master

Docs (master): Updates from release of 0.5.0.
Merge pull request #763 from andreaturli/feature/documentation

documented support for securityGroups, keyPair and loginUser.privateKeyFile
Merge pull request #764 from andreaturli/feature/jclouds-template-options

Added support for LOGIN_USER_PRIVATE_KEY_FILE