added three books about PHP, Shell and HTTP
Merge pull request #1263 from ruchee/master

added three books about PHP, Shell and HTTP
emacs rocks
Merge pull request #1266 from johand/emacsrocks_screencasts

emacs rocks
Update link to Java EE7 Tutorial
Merge pull request #1268 from Pythagory/master

Update link to Java EE7 Tutorial
ruby tutorial
Merge pull request #1269 from johand/ruby_book

ruby tutorial
Remove all dead links, close #1257