.functions: Add m to open stuff in TextMate

Closes mathiasbynens#253.

.aliases

@@ -15,7 +15,6 @@ alias g="git"
 alias h="history"
 alias j="jobs"
 alias v="vim"
-alias m="mate ."
 alias s="subl ."
 alias o="open"
 alias oo="open ."

.functions

@@ -251,3 +251,13 @@ function gi() {
 	local IFS=,
 	eval npm install --save-dev grunt-{"$*"}
 }
+
+# `m` with no arguments opens the current directory in TextMate, otherwise
+# opens the given location
+function m() {
+	if [ $# -eq 0 ]; then
+		mate .
+	else
+		mate "$@"
+	fi
+}