#2 Added a new class with useful sql queries: merge after restriction_to_collection

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tanja szeretne 8 commit-ot egyesíteni innen: tanja/sql_queries_class ide: tanja/master

Szerző	SHA1 Üzenet	Dátum
tanja	8a4a4e3aff fixed a type in get_field_mapping in ParseMapping	5 éve
tanja	97e3e26d61 minor fix in schema dereferencing: solved the problem with ' in schemas	5 éve
tanja	2c07703595 added possibility to change source and target names in the get_field_mapping method in ParseMapping	5 éve
tanja	7f8ae4956f added SQLQueries class	5 éve
tanja	316f568a5c resolved conflicts: added deferenced schema	5 éve
tanja	a975d9151b change in ParseJsonSchema	5 éve
tanja	62e0527dec fixed a typo	5 éve
tanja	2d8a0954db added restriction to a mongo collection to a constructor	5 éve