fixing issue 91 "Can't select the first character of a StringMorph or a TextMorph..."

https://github.com/davidedc/Zombie-Kernel/issues/91
when caret was at the beginning of text and user presses left, the caret would go to the end of the file. Fixed that.
removing 5 methods in globalFunctions.coffee that for some reason were duplicates
preparing the ground for some future double click action
build and docs