Increase VM memory size.

Required by Haystack and Solr.
Extracted Solr host and port into variables.
Download and install Apache Solr and Voikko.

Also disables the default Solr console logging. Further logging configuration
can be put in the configuration file template.
Upstart script to start Apache Solr automatically.
Formatting: split long lines.
Conditional starting of Solr.
Wait until Solr is ready, then index all the documents if the index is empty.
Merge pull request #9 from tituomin/search-role

Ansible: add a search role, which installs Apache Solr and the Finnish language libraries and dictionaries.