Ensure TERM is set to avoid tput warnings

At least on a Mac using Tower git client, if TERM was not set, tput dumped out warnings.  This suppresses error messages in third party applications that trigger the hooks.

Author: mrjoshuap

pre-commit

@@ -1,5 +1,7 @@
 #!/bin/bash
 
+TERM=${TERM:-unknown}; export TERM
+
 git_root=`git rev-parse --show-toplevel`
 failures=0
 RC=0