Don't always pull up the endstop pins. Let the user configure it with the Pin configuration (e.g. pull down instead of pull up).
change the default config to pull up end stop pins. *IF YOU WERE USING END STOPS BEFORE YOU NEED TO DO THIS*.
Merge pull request #166 from ennobler/edge

Allow endstop pull up/down configuration to be set via new config flags- do not force pull-up configuration