Skrey index feature

[joaoferreira-skrey]

• fixed issues on saving configuration parameters
• feature for logging requests added
• feature to select attributes where values should be processed as integer

[albertodoofinder]

@joaoferreira-skrey there are several conflicts in this PR and we cannot merge this changes into the branch. Please solve them

[joaoferreira-skrey]

@albertodoofinder conflits solved

[albertodoofinder]

Thanks @joaoferreira-skrey