Set dummy merge driver merge ours .gitattributes.
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.
Added some brief details on BFG http://rtyley.github.io/bfg-repo-cleaner/
A note about using 'git svn info' in build scripts

Also fixed a small typo
Added some brief details on BFG http://rtyley.github.io/bfg-repo-cleaner/
Added reference to BFG
A note about using 'git svn info' in build scripts

Also fixed a small typo
Merge branch 'master' of github.com:alecthegeek/progit into svn-info
Merge remote-tracking branch 'origin/svn-info' into svn-info

Conflicts:
	en/06-git-tools/01-chapter6.markdown
Updated after feedback on 548a15f
translated 3 sections
added no-nb to makeebooks script
'no-NB' translated 2 sub-sections chapter 1
no-NB translated 2 sections in Chapther 1

"Git has Integrity"
"Git generally only add data"
[cs] Synchronizing with [en] by structure and markup
Merge branch 'HEAD' of git@github.com:pepr/progit.git
no-NB translation Chapter 1#The Three States
no-NB translation Chapter 1#Installing Git

and Install Git through souce code
[cs] synchronization with latest [en] finished...

- examples (code snippets) fully synchronized
- text sychronization based only on structure and recognized markup
- newly found (missing in cs) translated
[cs] ch.1 -- translation revision/comparison with new [en] finished