apply bug fixes to 4.40.1

Applies fixes from master that weren't in the 4.40.1 release by accident

4.40 updates for lexographical ordering

Thanks to @mwshortt for the fixes here! This cherry-picks #47 onto the 4.40 branch.

Compatibility with HHVM 4.41-4.64

Thank you to @lexidor for making this compatible!

HHVM 4.40 compatibility

Thank you to @lexidor for making changes to make this repo compatible with HHVM 4.40

Small Parsing bug fix

v4.0.8

fix line of code that was inadvertently removed

Enable loading snapshots directly

Adding set all instances func to restore db state from json (#36)

* Adding set all instances func to restore db state from json

* remove whitespace

* Adding comment

Fixes for nested UNION queries

This makes it so that UNION queries inside of a FROM clause subquery work.

v4.0.5

Add bitmask operator support

Add license to composer.json

v4.0.4

Add license information to composer.json

Support type checking on HHVM > 4.0.4

Rename LICENSE.md to LICENSE

So that packagist picks it up