Added option to specify output file name with -o flag. Currently only…

[jhs507]

… takes realative paths.

[jhs507]

This feature is ready for review. You should be able to specify a relative or absolute path for the output file location with the -o option flag.

[KevinShook]

Worked for me -once I actually pulled the pull request.
One minor thing, which had me slightly confused, was that
the --help hasn't been updated yet:

$ ./crhm --help

crhm [options] PROJECT_FILE

	-h - Display this message.

	-t TIME_FORMAT - Select the format for date time outputs.
		Valid formats are:
		MS - Microsoft Excel floating point.
		ISO - ISO 8601 extended format YYYY-MM-DDThh:mm
		YYYYMMDD - YYYY MM DD hh mm

	-f OUTPUT_FORMAT - Select the file format for the output.
		Valid formats are:
		STD - Standard output format. Sutable for a spreadsheet.
		OBS - Observation file .obs format. Sutable for reading with CRHM GUI.

[jhs507]

Thanks Kevin. I will make sure the --help message is updated.