* Create a new parser for stream input

* Deprecate old parse (keep a wrapper class for BC)
* Remove use of preg_ function to avoid regexp size limit
* Bump min PHP version to 5.4.4 to avoid a bug with stream
* TODO: migrate tests and create new tests with stream

* Update Tests for the new StreamedPart

* Dump min PHP version to 5.6
* Update Travis conf to test new PHP versions

* Update Readme and convert to PSR-4

* Add converters

* Update extract of the sub parts