added an option to the parser to ignore unknown properties. option is called strict, and defaults to true to maintain current behavior
fixed error message in gem creation.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	icalendar.gemspec
fixed issues based on feedback and added comments to README
removed extranious ()'s from method calls
Merge pull request #15 from dbgrandi/master

Adds lenient parsing that discards unknown components