Enabled auto bed leveling and set correct axis step per unit

Remapped Y-Axis to Extruder-1 and substituted tabs with spaces in pins.h

Set right axis directions, velocities and accelerations, disabled auto bed leveling, set endstop logic, disabled max endstop, disabled TEMP_SENSOR_2 (???)

Added specific LCD controller definition in configuration file.

fpos_t type redefinition

Fix grammar/typos in new Configuration.h option

Revert "issue 968 for dev branch"

(For the SLOW_PWM_HEATERS option)

moved/renamed documentation stuff to top-level directory

406*406 pixels

Update Marlin Firmware URL

Some corrections and new features

Master

ramps do have power for the servos, the power comes from the power connector, not sure why this note was even made

ok

For cartesian bots, the X_AXIS is the real X movement and same for
Y_AXIS.
But for corexy bots, that is not true. The "X_AXIS" and "Y_AXIS" motors
(that should be named to A_AXIS
and B_AXIS) cannot be used for X and Y length, because A=X+Y and B=X-Y.
So we need to create other 2 "AXIS", named X_HEAD and Y_HEAD, meaning
the real displacement of the Head.
Having the real displacement of the head, we can calculate the total
movement length and apply the desired speed.

I have added some code in the "temperature.cpp" for have the possibility of control the time of the states with the heater drived by relays, with this feature now it is possible use PID function in conjunction with relay to control the temperature. I have made some tests and the temperature stay always in the range of +-1°C from the setted temp.
There is the possibility of turn on this features adding "#define SLOW_PWM_HEATERS" in Configuration.h