added ability to define multiple recipients with separate contexts

It's now possible to pass more than one recipient and either pass the same context variables for all recipients or pass separate set of context variables for each recipient
Merge branch 'feature/separate-contexts' into develop
sending multiple emails instead of one email to many recipients in case of passing single context array for many recipients
themes

5 default themes to choose from and ability to set them in config file
encapsulation fixes
Merge branch 'feature/themes' into develop