Added options for further response senders

refactoring existing options class
Added license and fixed methods naming
Fixed code style
Added handler for X-Sendfile response sender
Fixed code style
Fixed typo
Tidied and improved header in class files
Small fixes and improving of class file header
Refactoring of options classes
Merge branch 'x-send' of github.com:olekhy/HumusStreamResponseSender into x-send

Conflicts:
	src/HumusStreamResponseSender/Options/Apache2OptionsInterface.php
	src/HumusStreamResponseSender/Options/NginxOptionsInterface.php
	src/HumusStreamResponseSender/Options/Options.php
	src/HumusStreamResponseSender/XSendFileStreamResponseSender.php