Use SecureRandom.uuid in Component#new_uid
Merge pull request #77 from antoinelyset/add_standard_uuid

Use SecureRandom.uuid in Component#new_uid
Move TimeWithZone message to post install

Closes #73
Bump to version 2.1.1
Assume that no timezone transition rules specify 4th or 5th week of month
Add TZInfo spec for incorrect tzname generation with CEST
Use the real offset's abbreviation for tzname
Merge pull request #86 from jnv/master

Incorrect TZNAME in some timezones
Bump version to 2.1.2
Merge branch 'master' of https://github.com/icalendar/icalendar