Added `.lein-failures` to git ignore.
Added `.lein-failures` to git ignore.

saulshanabrook/Clojush,lspector/Clojush,Vaguery/Clojush,NicMcPhee/Clojush,NicMcPhee/Clojush,lspector/Clojush,Vaguery/Clojush,thelmuth/Clojush,saulshanabrook/Clojush,thelmuth/Clojush