initial cert expiration tool
implement missing features

 * Use VEVENTs instead of VTODOs.
 * Provide stable UIDs.
provide options

 * Use argparse to provide --help.
 * Process directories.
 * Provide a means to specify an output file.
provide option --duration

Allows to specify how many days before expiry events trigger.
provide debug logging with -v
use correct log levels

 * Use the log levels according to python-coding-guidelines_001.pdf
 * Make multiple -v options increase log level.
fix shebang

Required by python-coding-guidelines_001.pdf and works with macports.
process directories recursively and consider *.crt files
do not fail on file or parse errors
add file metadata

Required by python-coding-guidelines_001.pdf.
specify source encoding
Fixed dir parsing. Added subdir limit to paths ending with keyword
Added check for current date
Add ignore
Merge branch 'master' of ../certexpire

Conflicts:
	.gitignore