Fixes smtp mail provide to use UTF-8 as a default charset.
Fixes guava null value exception for when the field with a specific name doesn’t exist.
Merge pull request #35 from perfectsense/feature/mail-utf8

Fixes smtp mail provider to use UTF-8 as a default charset.
Adds support for multiple baseUrls for a storage item, selecting one based on a hash of the that storage item.
Merge branch 'release/2.4' of github.com:danslaughter2/dari into release/2.4