man/emu: Update 'push' description
man/emu: List commands before options
emu/push: Begin python 0.1.x re-implementation
libemu: Add Util class and readable/writable funcs
libemu: Add Util exists() function
libemu: Add Util.rm() method
libemu: Add Util.ls() method
libemu: Add Util.mv() method
libemu: Add Util.ln_s() method
libemu: Add a Util.mkdir() method
libemu: Add a Util.p_exec() method
libemu: Add a Util.rsync() method
libemu: Pad snapshot timestamps with zeros