Move files in preparation for new build system.
Update to new build system.

IMPORTANT NOTES!
* Do a "make clean" before pulling down this new build system.  This
  will cleanup files used by older build system as the new build system
  has moved things around a bit.
* Run linux_install, win_install.cmd, or mac_install to update the GNU
  toolchain used for the new build.  Note that there isn't a gcc4mbed
  directory anymore so these scripts are in the root of the Smoothie
  project.
* Run "make" from root of the Smoothie project.
* The binaries are now located in the src/LPC1768 folder <--IMPORTANT NOTE
* Make targets such as upload, etc. should still work as I attempted to
  port them to this new build system.
Output binaries to /LPC1768
Change /src/LPC1768 to /LPC1768 in .gitignore
Fix rules in src/makefile.

I moved the output binaries to /LPC1768 but the rules like upload,
flash, etc were still looking for the binaries in /src/LPC1768.
Conveyor: use get_tail_ref
TemperatureControl: use Pwm::max_pwm properly
Merge remote-tracking branch 'origin/edge' into feature/new_build

Conflicts:
	.gitignore
	build/mbed_custom.c
	gcc4mbed/build/gcc4mbed.mk
	makefile
	mbed/src/vendor/NXP/cmsis/LPC1768/GCC_ARM/LPC1768.ld

Fixed conflicts caused by heap tagging commit which modified several
files that had been moved around for this new build system.

NOTE: HEAP_TAGS has been disabled since it isn't compatible with newlib
      nano.  If we decide that we want to stay with newlib nano then I
      can update the heap tag code to work with this newer library.
Update README to no longer mention GCC4MBED.
Verify that malloc/realloc/free aren't called from ISR.

This was previously done with the malloc_lock() routine but this isn't
called from the newlib nano routines used in the new build.  This new
code provides wraps for malloc/realloc/free to first make this check of
the IPSR register and then call the real routines if not being called
from ISR.
Merge remote-tracking branch 'origin/edge' into feature/new_build
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
Merge remote-tracking branch 'upstream/edge' into newbuild

Conflicts:
	makefile
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.
Merge remote-tracking branch 'upstream/edge' into newbuild

Conflicts:
	makefile