change adding beforeConstruct event. It -can't be attached, so need internal method
disable test
check modified fields
add isStored method for document
check if document modified entirely
refactor status of document storing
save document improves
save document improves
add test for storing date
cache retreaved documents in memory
add multi update and refactor adding operators
change operator interface
unset field operator
use interface method instead of manual object init
fix passing array of data to Document::fromArray on already saved document
optimize ket of first-level key
Merge pull request #2 from vetalt/master

testPipelineAppendFewGroups
fix serial grouping
register PSR-compatible logger
Merge pull request #1 from sokil/master

update