first stab at documenting the Nestedset model
moves some methods to the correct chapter
Update nestedset.html

Patch of the century ;)
Merge pull request #552 from okhayat/patch-1

Update nestedset.html
fixed copy-and-paste failures
Merge pull request #553 from orcaaoshi/patch-19

fixed copy-and-paste failures
updated observer docs
Documented Model_Crud::count(). closes #554
Fix classes/agent/config.html
Merge pull request #555 from kenjis/fix_agent

Fix classes/agent/config.html
Explanation on how to use dynamic variables in language files
Merge pull request #556 from ngarneau/1.7/develop

Explanation on how to use dynamic variables in language files
fixed file permissions
updated fieldset field validation rules examples
removed broken links in Simpleauth intro
added a troubleshooting page for the email package. PR for problems please ;)
documented the new pipelining() method
documented "sessions without cookies"
documented nested sets dump_tree() method
added allow_x_headers to the Configuration docs