making macros work on pronterface

refactored reading pronsolerc as separate function, call that from pronterface

Added a short note in the README about another way to put python in 32bit mode for mac

Auto-select text after executing command (so when typing next command it gets overwritten)

Add skeinforge settings option to pronterface menu.
Fix mini window size on a mac.
Make retract option more robust.

Fix direction when reversing the extruder.

trim extraneous newlines from "loud" output