Adding NestedSet class and editing README.md
Editing main README.md
Adding Nested Set class file
fix some psr-2 errors
fix all psr-2 errors
fix all psr-2 errors again
fix all psr-2 warnings
Database session adapter bug

If `modified_at` value is '0' or NULL, actual session cannot be found.
Update Database.php
Update Database.php
Merge pull request #208 from tmihalik/patch-1

Session database adapter bug
providing more complex docs
Fix travis ci build
Merge pull request #210 from endeveit/master

Fix travis ci build
Merge pull request #206 from braska/master

Adding Nested Set behavior
Update README.md
Typo in Acl\Adapter\Database,  should be  when get count in the roles table.
Fixed error - keys dont flushed when Redis instance used prefix.
Merge pull request #217 from web777/master

Fixed error - keys dont flushed when Redis instance used prefix.
Fix CodeSniffer errors in Library/Phalcon/Cache/Backend/Redis.php