Parse the contents of unquoted here documents
Warn about assigned but unreferenced variables
Suggest pgrep when grepping ps
Merge pull request #7 from carenas/master

Include jsoncheck in 'make clean' target and update required ubuntu package list.
Merge branch 'master' of https://github.com/carenas/shellcheck into carenas-master
Fixed up readme
Merge branch 'master' of github.com:koalaman/shellcheck