Merge pull request #84 from chives/dev

Added edit value for editable columns when value is empty (closes #80)
ListContext refactoring
RequestHandlers introduction
Fixed tests and removed very long comment
Refactoring
Added deprecated note to CRUD_LIST_CONTEXT_POST_CREATE
Merge pull request #86 from norzechowicz/refactoring

CRUD list context refactoring
CreateContext refactoring
EditContext refactoring
Refactoring
Merge pull request #87 from norzechowicz/refactoring

Refactoring
Refactorized DeleteContext
Updated bundle configuration
Removed comments
Merge pull request #95 from chives/dev-refactoring

Refactorized DeleteContext
ResourceContext refactoring
Fixed exception type in resource context
Merge pull request #94 from norzechowicz/refactoring

ResourceContext refactoring
Moved context with builders to more proper namespace
Remove unused use statements