Added ext-json & ext-simplexml to Composer's requirements

Fix lib/autoload.php

Tests were renamed in more logical namespaces
Autoload uses Composer if possible, but have a fallback
to a custom PSR-4 autoloader.

address @orlitzky's comment: remove some files out of .gitattributes

Update to PHPUnit 6

This reverts commit c868eb5b.

Fix filename of .php_cs

JSON encoded post fields for relation creation

#195 add @params option to project->show() method

#195 add @params option, default is like before. Redmine Rest API only mentions trackers, issue_categories, enabled_modules - but not attachments, relations. Keeping for backward compatibility

Custom host

Escape all text values for any XML element properly

Clear leftover CURL options from previous request

add system line terminators

Use actual newline character in Issue::buildXML().