Add kvplist-merge function, test and readme text
Reimplement kvplist-merge as adviced by spacebat

Spacebat in the #emacs channel suggested to use the loop macro.
https://gist.github.com/4595042
Merge pull request #3 from leoc/master

Add kvplist-merge function - All looks good! merging and closing! I'll release a new version tonight if I can.