Add a chmod on the ~/.ssh on server

As remarked in #709, setting up a key-based server may need to set up
restricted rights.
translated 3 sections
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'no-NB' translated 2 sub-sections chapter 1
no-NB translated 2 sections in Chapther 1

"Git has Integrity"
"Git generally only add data"
no-NB translation Chapter 1#The Three States
no-NB translation Chapter 1#Installing Git

and Install Git through souce code
no-NB translation Chapter 1 installation done.
no-NB translation Chapter 1 First time setup
no-NB translation Chapter 1 everything after Setup
no-NB translation Chapter 1 translated.
no-NB trans Chapter 2 Git Basic
no-NB trans Chapter 2 Getting repository + 1 sub
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Merge branch 'master' of https://github.com/progit/progit
no-NB translate Ch. 2#Clone an Existing Repository
Merge pull request #836 from Onizuka89/master

no-NB chapter 1 translated
Merge pull request #777 from progit/ssh_chmod

Add a chmod on the ~/.ssh on server