add readthedocs badge
move argument types when update multiple
update composer
phpdoc
add factory method to get instance of stored document
add factory method to get instance of stored file
use factory methods to get document instance  in query bulider
phpdoc
add document to p[ool only if it enabled
fix tests
refactor document pool
php5.3 compartible
rename method
fix storing document to identity map in php 5.3
remove unused usage
phpdoc
add replace method
add phpdocs
Unconsisted state of documents, received from different sources #24
code beautify