Since these bindings have a potential usage clash with "gr", we add an
additional option here to do disable for the case where the user wants to keep
"gr" in their non programming modes but don't want find-refs type keybindings in
their programming modes.
g? may be another good candidate for finding references.
Move setup files into subdirectories. Move mode directories to modes subdir.
This will make it easy to specify a recipe in melpa that maintains the directory
structure. Add interactive functions to jump to .el and README files
See #170
