Start time entry with a time and list entries without projects

I switched the start_time_entries function to the time_entries endpoint, rather than time_entries/start.  the start endpoint only uses the current time and the time_entries one allows you to specify start (and finish) times.

I also found an error where the print_time_entries would fail if the time entry didn't have a project. I made sure to _properly_ set a a default "no project" description. I think I tried to do this before, but I didn't do  it right.