Small improvements

Hi, I made some small changes (improvements?) to your JS iCal parser:

1. Dates are now parsed as UTC and converted to local time
2. Event time scope is now based on ending time (line 181)
3. Continued lines (in my Google Calendar ics files basically a line break followed by single space in raw data, "\n ") are concatenated

maybe you are interested in taking them over, even though the project is perhaps not continued?