0.5.7

Compatibility fixes for Symfony 3

Merge pull request #37 from bravo3/feature/yaml-mapper

YAML mappings

Merge pull request #34 from bravo3/feature/index-methods

Added in methods to normal indices

Fixed maintenance script not updating unique indices

Merge pull request #30 from bravo3/feature/fs-driver

Filesystem Driver & Portation

Merge pull request #25 from bravo3/fix/related-index-deletion

Fix for indices with relationships not deleting properly

Merge pull request #24 from bravo3/feature/sorted-tables

Added sorted tables, naming sort indices

Merge pull request #19 from bravo3/fix/to-one-breaking-relationships

Fix for breaking to-one relationships

Merge pull request #10 from bravo3/potential-bug-with-refs

Fixed lingering refs