DataVal comments and code review.
Merge branch 'develop' of https://github.com/Taosmi/PHPro into develop
Folder lower/uppercase misunderstood.
Data validation and manipulation helpers revised.
Inputs extension revised.
The session extension has been simplified.
Javadoc revised.
First letter for the locales is now uppercase (System).
View extension revised.
.idea folder ignored.
Messages translations.
The error handler function now is part of the Router.php.
The auto-load functions are now part of Router.php.
Copyright date updated.