Merge pull request #42 from Ashrey/master

Mejoras varias
Merge pull request #43 from Ashrey/master

Fix var name
Eliminando metodos no funcionales de LiteRecord:
-allBy
-by
-firstBy

Adicionando a metodos para consultas sql con fetch automatico LiteRecord:
-all
-first

Adicionando metodos firstBySql y allBySql a ActiveRecord. Estos métodos invocan a parent::first y parent::all, ya que en esta clase estos son sobreescritos
Merge pull request #44 from Ashrey/master

Implement getParam
Refactor LiteRecord  first() and all()
Refractor again LiteRecord first() and all()
Merge pull request #46 from Ashrey/master

simplify
Merge pull request #48 from Ashrey/master

Flexibility
Merge pull request #49 from Ashrey/master

+ operator
Merge pull request #50 from Ashrey/master

#47 fix bug