Add executor and test for Nim

lxc/executors/nim

@@ -0,0 +1,4 @@
+cd /tmp/$2
+timeout -s KILL 10 nim --hints:off c code.code
+runuser runner$1 -c "cd /tmp/$2 ; cat args.args | xargs -d '\n' timeout -s KILL 3 ./code"
+

lxc/tests/test.nim

@@ -0,0 +1 @@
+echo("good")

lxc/versions

@@ -69,6 +69,9 @@ echo 'nasm'
 lxc-attach --clear-env -n piston -- /bin/bash -l -c "nasm -version"
 echo '---'
 
+echo 'nim'
+lxc-attack --clear-env -n piston -- /bin/bash -l -c "nim -v | head -n1"
+
 echo 'node'
 lxc-attach --clear-env -n piston -- /bin/bash -l -c "node --version"
 echo '---'