Remove coveralls badge
Remove coveralls badge

It was lying about our test coverage and making us look bad.
paultyng/pg_search,paultyng/pg_search,Casecommons/pg_search,Casecommons/pg_search,rigoleto/pg_search,mpivaa/pg_search,undergroundwebdesigns/pg_search,mpivaa/pg_search,undergroundwebdesigns/pg_search,savef/pg_search,rigoleto/pg_search,savef/pg_search