Merge pull request #659 from AlexandreToyer/master

Documentation: add page for XPATH parser
Merge pull request #660 from AlexandreToyer/master

Fix wrong image name in documentation
Fix memberOf recursive retrieval (groups attached to users)
Update libraries
Merge remote-tracking branch 'upstream/master'
GITBook integration
Merge pull request #664 from emmanuel-keller/master

Bug fix and improvement, first GitBook
Initial GitBook
Downgrade CXF
Merge pull request #665 from emmanuel-keller/master

Initial GitBook
Final merge
Merge pull request #668 from emmanuel-keller/master

Final merge
Fix Piwik tag
Merge pull request #669 from emmanuel-keller/master

Fix Piwik tag
Fix 404
Merge pull request #670 from emmanuel-keller/master

Fix 404
Fix links in APIv2 TOC
Merge pull request #671 from emmanuel-keller/master

Fix links in APIv2 TOC
Improve table of content
Merge pull request #672 from emmanuel-keller/master

Improve table of content