add an optional kill button which can be on the pause button pin or on a different pin
add to config
fix typos
Merge remote-tracking branch 'upstream/edge' into feature/kill-button
minor refactor of gcode dispatch
filter panel filenames that have .g in them
allow spaces in filenames in play command and from panel
refactor lc
fix path bugs
Merge pull request #508 from wolfmanjm/fix/allow-space-in-filename-filter-panel-files

Fix/allow space in filename filter panel files
Update to GCC4.8
fix panel directory navigation
Merge pull request #509 from wolfmanjm/upstreamedge

fix panel directory navigation
Merge remote-tracking branch 'upstream/edge' into update/gcc4.8
adamgr fix to win_install.cmd
update firmware.bin to binary built with new compiler
fix strange bug that happens with new compiler
Add directory indicator to mbed dirent
append / to directories in panel
speed up directory listing in panel
add / to directories displayed with ls
update firmware.bin
add crnl to end of M503 to flush in some cases
use puts in usbserial to output the banner
Merge branch 'upstreamedge' into update/gcc4.8
Merge pull request #512 from wolfmanjm/upstreamedge

add crnl to end of M503 to flush in some cases