history analysis

inspired by the zsh plugin 'debian', there now is a command called
'history'. with this command one can query the apt log files, to
list install, upgrade or remove events
added new functions

inspect - get info about a package
list -o - prints installed packages order by size
create (experimental) - create a script which would reproduce your system
option command

paket option <key> <value> can now be used
to toggle options for paket.
the first option is the fancy mode, introduced
in the later versions of apt. it renders a
fancy progress bar at the bottom of your terminal.
fixed typo in main
Merge remote-tracking branch 'sven/master'