AlternativeTo: Add a parameter for the API key.
Add Maven Spice metadata.
Merge pull request #489 from duckduckgo/jag/alternative_to

AlternativeTo: Add a parameter for the API key.
Added additional information to ruby_gems Spice.
Added a secondary_example_query to the Maven Spice showing the alternate trigger word "mvn".
Added a missing semicolon to the Maven Spice.
Merge pull request #493 from bradcater/maven-metadata

Add Maven Spice metadata.
Merge pull request #494 from bradcater/more-rubygems-information

Added additional information to ruby_gems Spice.