Config now checks for config.txt if config is not found
simple optimize
Merge pull request #141 from logxen/edge

Config now checks for config.txt if config is not found
move back to get_ref in conveyors flush
Merge branch 'edge' of github.com:arthurwolf/Smoothie into edge
Fix for make -j (n>1).

Enforce mbed SDK library dependency in root makefile.  Before it would
try to build both the mbed SDK and the Smoothie firmware at the same
time.

A better solution would be to pull the mbed SDK make steps into the
main Smoothie makefile so that the dependencies were clearer to make
which would allow it to build the SDK in parallel to the Smoothie
firmware.  I don't currently do this as the current build system is
closer to what was used before but now there are just sources and
makefiles which can build the mbed SDK (libs and headers) for us.  I
also expect most people to do their clearn builds from within the src/
directory once they have the mbed SDK built since they don't really
need to even keep looking at that part of the code anymore.
Fix #143 - SerialConsole::puts is broken in new build.

My dumb dumb!  Used the correct casting operator and actually tested
the UART serial path this time before committing.
Implement Johanns method of specifying segments for delta bots in segments per second.
Added a config delta_segments_per_second which defaults to 0, which is off
Modified mm_per_line_segment to turn off segmentation when set to 0, otherwise is exactly the same
If both mm_per_line_segment and delta_segments_per_second are set then delta_segments_per_second takes precedence
Implement Johanns method of specifying segments for delta bots in segments per second.
  Added a config delta_segments_per_second which defaults to 0, which is off
  Modified mm_per_line_segment to turn off segmentation when set to 0, otherwise is exactly the same
  If both mm_per_line_segment and delta_segments_per_second are set then delta_segments_per_second takes precedence
  Added example to rostock config which uses the delta_segments_per_second to match current Johanns Marlin/Delta
Merge pull request #144 from wolfmanjm/feature/delta-segmentation

Feature/delta segmentation
Looks pretty harmless, merging, thanks a lot for the feature !
fixing merge conflicts when merging edge back in