fixed asaskevich#150 asaskevich#151

Merge pull request asaskevich#123 from annismckenzie/custom_validatio…

…n_with_context

[BC break] Custom validation with context + smaller fixes

Fixed asaskevich#99

Updated README.md

Merge pull request asaskevich#50 from bom-d-van/master

ValidateStruct: Go through all fields instead return immediately on first error

ver 0.0.1