Fix trailing comma that cause Fatal SyntaxErrors

Got the following errors

```
[2014-03-04T06:08:57+00:00] FATAL: SyntaxError: compile error
/tmp/vagrant-chef-1/chef-solo-1/cookbooks/tomcat/recipes/default.rb:30: syntax error, unexpected ')'
/tmp/vagrant-chef-1/chef-solo-1/cookbooks/tomcat/recipes/default.rb:39: syntax error, unexpected ')'
/tmp/vagrant-chef-1/chef-solo-1/cookbooks/tomcat/recipes/default.rb:201: syntax error, unexpected $end, expecting kEND
```

Resolved by this update
Update server.xml.erb

if @ssl_port is nil, then Connector tag won't be closed. So closing bracket "/>" should be written outside of "<% if @ssl_port %> ~ <% end %>".
Minor fix to formatting on README.md
[#81] Fix to README

Signed-off-by: Christopher Webber <cwebberops@gmail.com>
Updates ubuntu DO image
0.16.2 Release