Eloquent docs update: eager loading using $includes example

Bulgarian translation

Ignore NULL values when determining whether a model object is dirty

Feature/eloquent update timestamp

Force UTF-8 charset on JSON responses

[Eloquent] Bug with eager loading relationships and isset()

Calling update() on an eloquent model has no way of overriding
the timestamp that should be set if $timestamps is set on the
model. This changes that so it uses the timestamp() function
which is an easy way to over ride the type of timestamps used.

Signed-off-by: Roumen Damianoff <roumen@dawebs.com>

Slightly re-organized and added some Session usage documentation

Fix a bug with Eloquent model classes and isset() when eager loading a relationship returns an empty result set.

Documentation typo

Updated Validation docs

Adding support for '=', in (:any) and (:any?) route patterns

Arabic Translation

Signed-off-by: Noor Alhiraki <alhiraki@gmail.com>

Updates to the German translation

Fix small typo in validation docs.

German Translation

fixed link for query builder