Deltabot settings and configuration adjustments.
Use X/Y/Z_MAX_PIN instead of X/Y/Z_MIN_PIN for top endstops on deltabot.
Enable QUICK_HOME for deltabot.
Add realtime delta geometry in Marlin_main.cpp.
Fix typo in MANUAL_HOME_POSITION (plural S missing) and reduce BLOCK_BUFFER_SIZE because 64 wasn't working for some reason.
Merged updates from Marlin_v1.
Fix home_all_axis to make QUICK_HOME work with Repetier-Host which sends G28 X0 Y0 Z0 instead of G28. Thanks to Matt Schoenholz for reporting this issue.
Fix typo (# missing before define).
{X,Y,Z}_{MIN,MAX}_POS are actually in Gcode coordinates.
Disable is now multi extruder compatible. M84 got a T option.
PID now per extruder. Fixed typo
Added CUSTOM_MENDEL_NAME option to Configuration.h and language.h

Also cosmetic comment changes and spelling corrections in printed
messages
Make M303 silent when "S0" is sent

If S is left out perhaps it should be silent, but check the spec for
this M code.
Support for 10 level deep SD folder hierarchy
Added support for Elefu RA Board and Elefu Control Panel
Turning off Control Panel by Default and Updating the link to the LiquidCrystal_I2C library to avoid confusion.
Merge remote-tracking branch 'upstream/Marlin_v1' into Marlin_v1
Adding servo documentation
Revert and extend previous change pin check change

Reviert previous change of #if BLAH_PIN > 0 to #if defined(BLAH_PIN) &&
BLAH_PIN > -1. Unfortunately some times pin 0 is used. For my sins I've
gone through and replaced all unsafe checks of #if BLAH_PIN > -1 with
the safe version.
Merge pull request #490 from buildrob101/Marlin_v1

Revert previous change pin check change