Update README.md
Some clarification and markdown for boelle notes
Merge pull request #1230 from thinkyhead/readme_tweak

Clarification and markdown for boelle notes
Fixed BABYSTEPPING feature

Moved PSTR() macro to correct place which was causing the " initializer fails to determine size of '__c' " when attempting to compile with BABYSTEPPING enabled.
Added "auto fan" checks to PID_autotune
Update README.md
Update README.md
Merge pull request #1239 from ErikZalm/Marlin_v1

getting even with v1
Update README.md
heater.c: Limit PID I term with conditional integration.
temperature.cpp:Add PID Conditional integration on heated bed.
Configuration.m: Set PID_INTEGRAL_DRIVE_MAX from PID_MAX from BANG_MAX.

Current defaults are all 255.  If it makes sense to reduce them, they should come down together, and
be in a  PID_INTEGRAL_DRIVE_MAX <= PID_MAX <- BANG_MAX relationship.
Move initialization of errormagic[] and echomagic[] to Marlin_main.cpp
LCD Progress Bar
Merge pull request #1251 from thinkyhead/progress_bar

LCD Progress Bar
Merge pull request #1250 from chertykov/Development

Move initialization of errormagic[] and echomagic[] to Marlin_main.cpp
Merge pull request #1249 from drf5n/PID_CI_v2

 temperature.cpp: Add Conditional Integration to prevent excessive integral windup
Merge pull request #1234 from gregrebholz/issue_1069

Fixes #1069.  Added "auto fan" checks to PID_autotune.
Merge pull request #1233 from NarimaanV/Development

Fixed BABYSTEPPING feature
Consider negative Z Offsets when auto bed leveling is active