downgrade j.rb to version 802

per http://www.jsoftware.com/stable.htm, version 803 is a beta,
which may explain why the binary was changing, breaking the checksum.
update librecad.rb to 2.0.5

* provide mountain lion-specific download
* update license to :gpl
Fix checksum in Pharo.app Cask
document `appcast` stanza

The :latest_version key stays undocumented, as it is not
clear yet whether it is useful
Upgrade Oracle Java to 1.8u25
Merge pull request #6681 from bfanger/java

Upgrade Oracle Java to 1.8u25
Merge pull request #6679 from Zi0P4tch0/pharo-cask-fix

Fix checksum in Pharo.app Cask
appcast :format in epub-to-pdf
appcast :format in xamarin-android
appcast :format in xamarin-ios
appcast :format in xamarin-studio
Merge pull request #6677 from rolandwalker/j_downgrade

downgrade j.rb to version 802
Merge pull request #6678 from rolandwalker/librecad_2.0.5

update librecad.rb to 2.0.5
Adds multipatch cask v1.4

Multipatch can be used to apply IPS patches, among other things.
Merge pull request #6685 from vitorgalvao/fix-6684

Adds multipatch cask v1.4
Upgrade Opera to 25.0.1614.50
Merge pull request #6687 from crainiarc/opera

Upgrade Opera to 25.0.1614.50
Delete b2designer cask

Unfortunately, both listed URLs stopped responding and I couldn't find
anything on Google about this application.
Merge pull request #6688 from yegortimoschenko/delete-b2designer

Delete b2designer cask
Specify that Back in Time is commercial software