Update index for Groovy/Gradle/Grails.
Reorder go list
Added 'Linkers and Loaders' book

Not quite sure but the 'compilers' section seems to be the closest fit.  Author has freely downloadable manuscript in TROFF and Postscript and links to purchase hard copy on Amazon etc
Merge pull request #1009 from andymc73/patch-3

Added 'Linkers and Loaders' book
Merge pull request #1007 from sudoyu/patch-2

Update index for Groovy/Gradle/Grails.
Merge pull request #1008 from Mouseion/patch-1

Reorder go list
Update the link to the Aprende a Programar con Ruby.

The link is outdated because the GitHub organization maintaining the book
changed their name. The link currently works because of a redirect, but it
would better to replace it with the current link.
Update README.md
Remove dead java link
Merge pull request #1011 from viggyprabhu/patch-1

Typo
Merge pull request #1010 from jbranchaud/update-aprende-a-programar-con-ruby

Update the link to the Aprende a Programar con Ruby.
Add Spock Framework(Groovy) documents in Japanese.
Added Swift Programming language book

Recently introduced at WWDC 2014, added official programming language book from Apple
Merge pull request #1013 from augbog/master

Added Swift Programming language book
Merge pull request #1012 from sudoyu/patch-3

Add Spock Framework(Groovy) documents in Japanese.
26000
Remove dead links close #1000
Add Groovy(Gradle/Grails/Spock) documents.
Merge pull request #1014 from sudoyu/patch-4

Add Groovy(Gradle/Grails/Spock) docs.
Added Haskell Course