Raw order by support

Merge pull request #1 from rtakauti/master

Sortable column add feature - orderByRaw

5.0.5

• Alias support
• Recursive relations support

protected $sortable = [ 
    'editor_ilustracao_lote' => 'lote.nome_lote', 
    'editor_ilustracao_codigo' => 'codigo', 
    'editor_ilustracao_ilustrador' => 'lote.ilustrador.nome', 
    'editor_ilustracao_rafe' => 'raf_status', 
    'editor_ilustracao_status' => 'status'
];

5.0.4

Fix bug on invalid relation
Fix exceptions
Add support to HasMany and BelongsTo