Create qlplugindir during init.
Test qlplugindir auto-creation.
Update Gimp from Lisanet to 2.8.10
virtualbox-4.3.4-91027
Merge pull request #1894 from chulkilee/virtualbox-4.3.4-91027

virtualbox-4.3.4-91027
Merge pull request #1891 from Anakros/gimp-lisanet-2.8.10

Update Gimp from Lisanet to 2.8.10
Intellij idea casks renamed to include full product name
Merge pull request #1893 from pavel-sakun/intellij-idea

Intellij idea casks renamed to include full product name
Update Contributing guide

Add a mention of `rake` command to use tests.

Refs #1893
Add Color Oracle to Casks
Update Color Oracle cask

* Use `version 'latest'` scheme based on URL.
update ynab to .351
Merge pull request #1897 from andrewoke/master

update ynab to 4.3.351
Merge pull request #1896 from donokuda/add-cask-color-oracle

Add Color Oracle to Casks
Lyn 1.3.7
Fantastical 1.3.11
KeyRemap4MacBook 9.2.0
Merge pull request #1898 from ahbeng/fantastical

Fantastical 1.3.11
Merge pull request #1899 from ahbeng/keyremap4macbook

KeyRemap4MacBook 9.2.0
DNSCrypt 0.19