Create .gitignore.

Start by ignoring Idea files and directories.
If cephx is disabled, skip all the key generation and authentication.
When generating the RadosGW VHost, add support for optional ServerAliases.
Add the HTTP Host: to the access_log record.  Useful when using bucket based sub-domains.
Remove .gitignore
Merge branch 'master' into add-vhost-to-accesslog
Merge branch 'add-vhost-to-accesslog' into cdmaster
Merge branch 'ignore-cephx-if-disabled' into cdmaster
Merge branch 'rgw_host_aliases' into cdmaster