Add Travis CI config to build Marlin firmware.

Changed graphic LCD info screen to match the set # of extruders

Here comes a compile-time operation to match the extruder symbols on the
info screen to the set number of extruders in configuration.h.
When only one extruder is selected, the "1" on the symbol will not be
displayed.

Added some background on the filament sensor to explain it better.

Added support to show the filament width on the status line of the
graphic LCD.  The status will show for 5 sec and then switch over to
data.  Status can be seen by clicking the button.

Changes to support displaying the real-time filament width and the
volume factor on a 20x4 LCD.  The data is displayed on the 4th line.
First the status message is displayed for 5 seconds, and then the
filament data is displayed.  The status message can be seen by
re-selecting the info screen in the menu.

Comment out the FILAMENT_SENSOR define by default in config.

Commented out the FILAMENT_SENSOR define so that it is not enabled by
default.  Code does not work on all hardware variants.

Sync up from my Marlin_v1 to Filament-sensor

Sync up to Marlin

Updated example configurations for Delta printers

Fixed typo.

Support for a filament diameter sensor

Signed-off-by: Christian Inci <chris.pcguy.inci@gmail.com>

Fix "add_homeing" to "add_homing" to match changes

Update line 627 ,wrong number on thermistortables

Wrong number on line 627 > i change number "12" by the correct number "13"
Soory

Added profile for RAMPS with 2 extruders and 1 fan, no heated bed

Wing fix float delta

Add thermistor table

Update motion_control.cpp

Simple code cleanup. Rename "homeing" to homing.

Proposed feature: Set Home Offsets

Adjust the Z display to hide float rounding errors

Make hotend optional when compiling with lcd support

Signed-off-by: Matthew Schick <matthew.schick@gmail.com>

Add an item to the LCD menu that applies the current axis position to
the “add_homeing” offset.

G03 Full circle did not work (G02 is working correct)

Add another thermistor table (13),it's a cartridge thermistor up to +300°C,use with Hotend "Simple ONE" & "All In ONE"

Thx

Add another comment for thermistor 13 ,use with Hotend "Simple ONE & All In ONE"

Add another comment on configuration.h for the value of thermistor.
I make a pull request on thermistortables.h with my thermistor (12),but y see there is a comment on configuration with number 12 but it's not present on thermistortables.h ?

Thx

Add another thermistor table,use with hotend "Simple ONE" & "All in ONE"

Corrected retract() call for use of auto probe without sled enabled.

Fix build for non-sled bed auto levelling

This function should only be used with sled, not all bed auto
levelling.

Fix issue 935: error in matrix calculation

Added the new m-codes to this document.

	modified:   Marlin/Configuration.h
	modified:   Marlin/pins.h