two functions to get changed file between two branches have been added

lib/git.zsh

@@ -139,6 +139,14 @@ function git_pull() {
   git pull origin `git_current_branch` --rebase
 }
 
+function git_changed_files() {
+    git diff --name-only $1 $(git merge-base $1 $2)
+}
+
+function git_changed_files_since_master() {
+    git_changed_files $(git_current_branch) master
+}
+
 #this is unlikely to change so make it all statically assigned
 POST_1_7_2_GIT=$(git_compare_version "1.7.2")
 #clean up the namespace slightly by removing the checker function