Ignore SC2033 when passing quoted function names.
Improve warnings for $ in (()). Also improves array subscripts.
Prevent overlap of 2116 and 2005 in foo $(echo $(bar))
Only warn once per unused variable name.
Update ShellCheck.cabal

Fixed License.
Merge pull request #226 from aycanirican/patch-1

Update License in ShellCheck.cabal
Don't crash on empty files with -f gcc.
Merge branch 'master' of github.com:koalaman/shellcheck
Fixed quoting warnings for variables in $".."
Don't trigger SC2004 for (( $$ ))