Add PHP track
Add Go koans
Merge pull request #1035 from Mouseion/patch-interactive

Update interactive tutorials
Added Human Javascript
Added I Love Ruby
Merge pull request #1036 from mradamh/human-javascript

Added Human Javascript
Merge branch 'master' of github.com:mindaslab/free-programming-books into mindaslab-master
Merge branch 'mindaslab-master'
[en] Adding DevOps for dummies
Add MongoDB Succinctly ebook.
Merge pull request #1039 from levibostian/mongo-db-succinctly

Add MongoDB Succinctly ebook.
Merge pull request #1040 from esparta/master

[en] Adding DevOps for dummies
Added czech podcasts
Merge pull request #1042 from grogy/czech-podcast

Added czech podcasts