Add api documentation (#361)

you

2017-06-05 987cc5a6a425b1f9bcd9000608dc389a45c675a1

 technic/machines/register/machine_base.lua

@@ -168,13 +168,13 @@
         if not string.find(node.name, ":lv_") then
            form_buttons = fs_helpers.cycling_button(
               meta,
               "image_button[0,4.3;1,0.6",
               pipeworks.button_base,
               "splitstacks",
               {
                  {text="", texture="pipeworks_button_off.png", addopts="false;false;pipeworks_button_interm.png"},
                  {text="", texture="pipeworks_button_on.png",  addopts="false;false;pipeworks_button_interm.png"}
                  pipeworks.button_off,
                  pipeworks.button_on
               }
            ).."label[0.9,4.31;Allow splitting incoming stacks from tubes]"
            )..pipeworks.button_label
         end

         meta:set_string("infotext", machine_desc:format(tier))
@@ -202,13 +202,13 @@
         if not string.find(node.name, ":lv_") then
            form_buttons = fs_helpers.cycling_button(
               meta,
               "image_button[0,4.3;1,0.6",
               pipeworks.button_base,
               "splitstacks",
               {
                  {text="", texture="pipeworks_button_off.png", addopts="false;false;pipeworks_button_interm.png"},
                  {text="", texture="pipeworks_button_on.png",  addopts="false;false;pipeworks_button_interm.png"}
                  pipeworks.button_off,
                  pipeworks.button_on
               }
            ).."label[0.9,4.31;Allow splitting incoming stacks from tubes]"
            )..pipeworks.button_label
         end
         meta:set_string("formspec", formspec..form_buttons)
      end,
@@ -246,13 +246,13 @@
         if not string.find(node.name, ":lv_") then
            form_buttons = fs_helpers.cycling_button(
               meta,
               "image_button[0,4.3;1,0.6",
               pipeworks.button_base,
               "splitstacks",
               {
                  {text="", texture="pipeworks_button_off.png", addopts="false;false;pipeworks_button_interm.png"},
                  {text="", texture="pipeworks_button_on.png",  addopts="false;false;pipeworks_button_interm.png"}
                  pipeworks.button_off,
                  pipeworks.button_on
               }
            ).."label[0.9,4.31;Allow splitting incoming stacks from tubes]"
            )..pipeworks.button_label
         end
         meta:set_string("formspec", formspec..form_buttons)
      end,