removed Step(ms) to correct error when compiling managers library
simplified setup procedure regarding Makefile.darwin-op for managers library
added some instructions regarding walk controller.

Please disregard the issue posted on segmentation fault and keyboard.
Fixed a performence loss when the robot is hidden
added commented to walk.cpp

just in case users do not read the README_FIRST.txt file
corrected some grammatical typos on the comments section
removed previously commented lines
Renamed doc
Merge remote-tracking branch 'upstream/master'
Merge pull request #219 from fabienrohrer/master

Renamed documentation files