Fixes Variables, 2.5, issue #8

Fixes #8

Signed-off-by: Irina Chichikova <diva.artim@gmail.com>
Fixes Variables, 2.6, issue #9

Fixes #9

Signed-off-by: Irina Chichikova <diva.artim@gmail.com>
Fixes Variables, 2.7, issue #10

Fixes #10

Signed-off-by: Irina Chichikova <diva.artim@gmail.com>
Fixes Variables, 2.8, 2.11 and 2.12, issue #11

Fixes #11

Signed-off-by: Irina Chichikova <diva.artim@gmail.com>
Fixes some bugs

Signed-off-by: Irina Chichikova <diva.artim@gmail.com>