APIQ Core (KMS) v1.0 compatibility

• [fixed] find_by and find_all_by now can find results not only by dynamic fields but also by id, slug, position and etc.
• [added] add slug attribute to entry drop
• [added] support Amazon S3 storage - closes #14
• [added] add blank state screens for models and entries
• [added] automatic Model's collection_name and Fields liquor_name generating - closes #16
• [changed] replace JSON column with JSONB - closes #15
• [added] Sorting (by dran'n'drop) Model's fields - closes #4
• [fixed] fetch item only in scope of model - page's templatable type