Avatar cropping: server side

Test Plan:
no
no

Reviewers: alex, max, ilgiz, vissi

Reviewed By: vissi

Differential Revision: https://review.crowd-lab.com/D1509
Create LICENSE
Update LICENSE
Update README.md
do not clear translations by default
add 100x100 avatar size

Test Plan: no

Reviewers: alex, max, ilgiz, vissi

Reviewed By: vissi

Differential Revision: https://review.crowd-lab.com/D1539
ascii data type

Test Plan: -

Reviewers: alex, max, mrkonstk

Reviewed By: max

Differential Revision: https://review.crowd-lab.com/D1535
chpu preprocess
Merge branch 'master' of github.com:crowdlab/webcore into beta