Escape space characters in the URLs for example requests
Created by: Zhicheng-Liu
For some endpoints species alias that contains space charactter could appear in the URI path. In some languages and tools, URLs are not automatically encoded. The space characters in the URLs cause failure in the requests.
This change escapes space characters in the URLs for the example requests for Curl, Java, Perl and Ruby, according to this document: http://template-toolkit.org/docs/manual/Filters.html#section_url
Fixes ENSEMBL-4809.