[4h?] Classify page: Run ML model on sample images dataset

[tadeuszbaraslupski]

Acceptance criteria

• Make sure that the actual Serengeti model is ran on images from the provided folder in dev version and that a correct output is produced, in the same format as used in Explore page: display data from the opened file on the chart and arrange layout #5 .
• test this on test images dataset from Robbie
• progress should be displayed correctly and be informative, and the entire flow needs to be helpful to non-technical user
• test Explore page and resolve any issues in Explore page that show up or create issues for them
• show error if models runner or model files are not present - inform that they need to unpack models in the application directory

[marekrogala]

@kamilzyla I think we've actually already started this yesterday, so I think this may be quick and it's good to finalize this task

[kamilzyla]

I marked "test this on test images dataset from Robbie" as done. There were problems with classifier dying on my machine sometimes but it is now tracked in #74.

[kamilzyla]

The last point, "show error if models runner or model files are not present" will be better tracked in issue #47; I'll close this issue.