Merge pull request #31 from petrknap/if-present-else Added `else` argument to `ifPresent`

Merge pull request #30 from petrknap/fix-equals Semi-correct `equals` behavior

Merge pull request #29 from petrknap/improved-phpdocs Fixed `flatMap` behavior

Merge pull request #28 from petrknap/as-nullable-and-falsable Added `toNullable` method

Merge pull request #26 from petrknap/support-for-exception-message Added support for message to `orElseThrow` method

Merge pull request #25 from petrknap/improved-or-else-throw-method Added support for exception class name instead of supplier

Merge pull request #24 from petrknap/soft-warnings `Logger` replaced by suppressible notices

Merge pull request #23 from petrknap/chores Deprecated `Logger`

Merge pull request #22 from petrknap/ide-test Removed unnecessary notices

Merge pull request #19 from petrknap/falsable Implemented method `ofFalsable`