guide wip
added doc files
started performance section of the guide
more on performance tuning
example for using asArray
migration docs
code reorganization fix.
upgrading instructions WIP
Finished the initial draft of upgrading instructions
Fixed doc about renderers.
Added dirty attribute description.
Added namespace section.
Controllers section example fix
Fixed typo
Merge pull request #151 from lucianobaraglia/master

Fix in docs
Wrapped code with github-style blocks with PHP highlighting
fix
fix
Fixes the variable name
CS fixes.