smk view sub-command

Add a sub-command to the smk command, called 'view'.
It would immediately display a map in the default browser, with no application or configuration needed.
It would allow options in the command line that mirror the options that SMK can parse in the URL.
For example: 
'smk view --center=[LONG],[LAT],[ZOOM]` would open the map centered at LONG,LAT at ZOOM level.
