Merge pull request #69 from khonkhortisan/master

Keep vertical wire base from self-intersecting
Fix piston drops and craft recipe
Merge branch 'master' of https://github.com/Jeija/minetest-mod-mesecons
Merge pull request #70 from khonkhortisan/eghoststone

Make ghoststone conductive
Fix #73 - receiver wire drops down one node when connected button is dug.
Make load times faster by avoiding inventorycube and wielditem creation in technical blocks such as active wires and various piston orientations.