Added intro comment to code
Renamed one of 'API error' back to 'HTTP error'
Tests: added persons.getActiveSources
Tests: added persons.getPopularSources
Tests: added persons.getCategories
Tests: added persons.search
Readme: added Example before methods
Readme: describe getCurrentRate

(whatever it is for)
Readme: describe getActiveSources
Readme: describe getPopularSources
Readme: describe getCategories
Readme: describe persons.search
Changed default timeout to 20 seconds

A search across many sources (the 'all' set) can take a while to complete.
Readme: added timeout the Configuration example
Readme: clean up readability