Add tech logos to search results.
Merge pull request #475 from MastodonC/feature/add-tech-logos-to-search

Add tech logos to search results.
Advanced search documentation

Based on functionality documented here:

http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/query-dsl-query-string-query.html#query-string-syntax
Fixed typos.
Merge pull request #476 from MastodonC/feature/search-docs

Advanced search documentation
Add tech logos to search results.