Add service providers of plugins to phpDocumentor's container.
Add twig sort filter

Related to https://github.com/phpDocumentor/template.clean/issues/15
Call it sort and implemented sort_asc and sort_desc
Throws exception if class does not exist
Add links to tags in the menu
Move inheritance and type information to its own documents
test was producing 66 chars rather than 68
ArgumentReflectorMock must also mock isByRef() method call;
Merge pull request #1092 from ashnazg/fix-build

Fix the isByRef errors in the build
Small documentation tweaks and write type document
Merge pull request #1086 from siad007/patch-5

Add twig sort filter
Merge branch 'develop' of github.com:phpDocumentor/phpDocumentor2 into develop
Merge pull request #1082 from siad007/patch-4

Add service providers of plugins to phpDocumentor's container.
Merge branch 'develop' of github.com:phpDocumentor/phpDocumentor2 into develop
Add information on inheritance
Fix typo
Add missing element names
Fix typo
Write a guide on running phpDocumentor
Write a guide on running phpDocumentor