Deprecate google code downloads, point to sourceforge / github
As of current Git version, --all-match matches greps
Merge pull request #735 from linquize/googlecode

Deprecate google code downloads, point to sourceforge / github
Merge pull request #737 from worklez/all-match-for-greps

As of current Git version, --all-match matches greps
Merge pull request #738 from daftano/master

[it] update chapters 2 and 6
[it] updating chapter6

Reviewed "A SHORT NOTE ABOUT SHA-1"