Fix the contribute guide

Composer install `--dev` flag isn't required any more.
Test preparation command for sqlite tests was incorrect.
Test launching command was incorrect.
Merge pull request #291 from K-Phoen/patch-1

Fix the contribute guide
Fixing typo in AND/OR clause example

The subcriteria's used for the example weren't properly defined.  Missing $cton2, fixed that in examples.
Merge pull request #293 from aztechy/patch-1

Fixing typo in AND/OR clause example
broken link to i18n behavior docs

Updated the link, maybe would be useful to update the whole doc, but for now it's good to at least provide an usable link to the docs reference.
Update 02-buildtime.markdown

Typo fixed :)
Merge pull request #295 from curlymuse/patch-1

Update 02-buildtime.markdown
fix some method names
Merge pull request #298 from dll1024/patch-1

fix some method names
Merge pull request #294 from gattytto/patch-1

broken link to i18n behavior docs
Update runtime-introspection.markdown

forgotten $ in the RelationMaps chapter
Merge pull request #300 from ferjul17/patch-9

Update runtime-introspection.markdown
Added new layout.

Moved behaviors, references and cookbook to documentation folder.
Merge pull request #299 from marcj/new-layout

Added new layout.
slightly color change in links
Fixed responsive view of full-page sites.
replaced favicon with new blue design
Merge pull request #303 from nymo/update-favicon-to-new-layout

replaced favicon with new blue design
Update 03-basic-crud.markdown
Merge pull request #304 from mickaelandrieu/patch-1

Update 03-basic-crud.markdown