add support for xar containers

references: #5442
Convert backtick commands to Cask::SystemCommand.run

Closes #4971
Merge pull request #5623 from federicobond/remove-backtick-commands

Convert backtick commands to Cask::SystemCommand.run
Add Hosts.prefpane v1.3

Add Hosts.prefpane v1.3
Merge pull request #5622 from rolandwalker/xar_containers

add support for xar containers
Merge pull request #5624 from taka-ez/taka-contrib-cask

Add Hosts.prefpane v1.3
Java workaround for IntelliJ IDEs added
Merge pull request #5502 from radeksimko/intellij-ides

Solve issues with Java for all IntelliJ based IDEs
Update boot2docker to v1.1.2

Release details: http://git.io/vHbTaQ
Merge pull request #5627 from createdbypete/update-boot2docker-v112

Update boot2docker to v1.1.2
Update Lyn app to latest version 1.5.2
Merge pull request #5629 from ngocphamm/patch-18

Update Lyn app to latest version 1.5.2
Update Racket to 6.1

Additionally, reuse `version` value in `url` and `link` stanzas.
Merge pull request #5631 from ndr-qef/racket

Update Racket to 6.1
Upgrade Baidu Input Method to v3.3_1000e
Merge pull request #5632 from vitorgalvao/fix-5626

Upgrade Baidu Input Method to v3.3_1000e
Update Pharo-3.0 SHA #5634
Merge pull request #5635 from kaniza/master

Update Pharo-3.0 SHA #5634
add proxifier
Re-enable suggestion tests