v1.1f (2017-08-02) Release

Grbl-Mega is virtually identical to the mainstream Grbl repo except for the following differences.

• Sleep mode: A unique optionally-enabled feature that automatically puts Grbl into a "sleep" mode if there is no input from a GUI after a certain amount of idle time. Used primarily by OEMs.
• Line number tracking is enabled and can not be disabled.
• M7 mist coolant is enabled and can not be disabled.
• Variable PWM spindle is enabled and can not be disabled.
• There is a separate spindle enable IO pin to indicate when the spindle is on or off only. Can behave differently depending on config.h options. PWM pin still behaves the same.
• Planner buffer size has been increased from 15 blocks look-ahead to 35 blocks.
• Segment buffer size has been increased from 6 segments to 10 segments to account for larger planner.
• Incoming line buffer size has been increased to 256 bytes, so Grbl can now parse lines up to 256 characters long per the g-code standard.
• Serial RX and TX buffers have been increased to 255 bytes each.