is_ssl() is more reliable than $_SERVER['https']

Fixes #5
Version bump. 0.8.2-dev
Merge pull request #9 from om4james/ssl

Better SSL/HTTPS detection. Props to @emilbjorklund for reporting the initial problem.
Changelog update for #9 / #5

Improved SSL/HTTPS detection.
Merge branch 'master' of github.com:kasparsd/widget-context-wporg
Merge remote-tracking branch 'upstream/master' into filter