fixes header field names being case-sensitive (they must be case-inse…

…nsitive)

some refactoring

merge the two exception packages

Merge pull request #1 from 1gravity/feature/publish_artifact

Feature/publish artifact

Update build.gradle

Update build.gradle

Merge pull request papsign#86 from DarkXanteR/master

Support ISO DateTime strings in parameters

added byte and short primitive converters

fixed PR papsign#75

Merge pull request papsign#75 from volanty/issue-74

fix npe when missing required field