Escape grep

Some people have ack-grep aliased to grep which has different exit
codes. This will mess up the detection and not produce the desired
results.

scripts/rvm

@@ -72,15 +72,15 @@ fi
 
 if [[ -n "${BASH_VERSION:-}" ]]
 then
-  if type rvm 2>&1 | grep 'function' >/dev/null
+  if type rvm 2>&1 | \grep 'function' >/dev/null
   then
     rvm_loaded_flag=1
   else
     rvm_loaded_flag=0
   fi
 elif [[ -n "${ZSH_VERSION:-}" ]]
 then
-  if type rvm 2>&1 | grep 'function' >/dev/null
+  if type rvm 2>&1 | \grep 'function' >/dev/null
   then
     rvm_loaded_flag=1
   else