Merge pull request #3 from mister-spock/feature/add-to-string-method

Update PHPUnit, add '__toString()' method implementation, add tests

Merge pull request #2 from mister-spock/master

bugfix() Fix how "Some::filterIsOneOf()" traverses through received parameters array

Merge pull request #1 from corporealshift/filter-isa

Add filterIsA and filterIsOneOf

Merge pull request schmittjoh#27 from matteosister/patch-1

small typo in Option.php doc comment

Merge pull request schmittjoh#10 from asm89/foreachable

Make it possible to consume the Option value using foreach

simplifies method

Merge pull request schmittjoh#7 from pborreli/patch-1

Fixed typo

adds getOrThrow method

adds select/reject methods

minor tweaks