Merge pull request #4 from colinmollenhour/hotfix

Fix undefined method error.
Merge branch 'master' into develop
[TASK] Changes from php-cs-fixer
[TASK] Extensive documentation
Move code into src subdirectory.
[TASK] Changed composer.json
[TASK] Added proper readme file
[TASK] Changed namespace from 'Firegento' to 'FireGento' to be more compatible with the other FireGento extensions
Rename files from Firegento to FireGento.
[FEATURE] Added phpDox config file & generated php docs
[TASK] some more docs
few improvements readme file
move the config `viewer_enabled` to the general section because its not only related to the database logger adapter