#1131: ConstantConverter errored when Namespace was a string

In some circumstances the namespace may be a string; in these cases
the code threw a fatal error because it could not resolve the FQSEN
of that Namespace. This commit resolves the issue by tightening the
checks.
#1131: Add missing import statements

The Method and PropertyConverter had a check added but the import
statement was omitted. This caused the check to always fail.
Fixes #1090: update GraphViz dependency

There was an error in the GraphViz library that was fixed and tagged. This commit
updates the composer.lock to include this new release.
Preparing release 2.3.1
Commit package file for 2.3.1
#1133: Fixed subpackage without package validation

The validation that checks whether a subpackage without package
should not exist errored whenever a subpackage was present. This was
due to the package member of a Descriptor not correctly being populated.

This specific issue has not been resolved but the validation is changed
to use the actual tag information instead of the enriched package
information. This provides a more accurate reflection of the situation
and fixes the issue at the same time.
Added ext-twig and ext-xslcache to the suggest list.
Merge pull request #1136 from siad007/patch-5

Added ext-twig and ext-xslcache to the suggest list.
Add a test for ProjectAnalyzer

As part of the on-going effort to improve Code Coverage for
phpDocumentor I have written a test for the ProjectAnalyzer class
and did minor refactorings for readability.
New plugin for converting legacy namespaces (resolves #666)
Fixed regEx used by internal filter

Fixed #152
Merge pull request #1139 from siad007/patch-5

Fixed regEx used by internal filter
#152: Classes were not filtered

The StripInternal and StripIgnore filters were not applied to
ClassDescriptors. This commit adds Classes to the list of elements that
can be stripped and ignored.
Fixes #1120: Tagged latest stable of DOMPDF and ezcDocument
Bump version to 2.3.2 in prep of release
Merge branch 'master' into develop
Update Composer installation instructions

- Update the link to phpDocumentor on Packagist
- Update the Composer require command
- Add a note on how to run phpDocumentor from the vendor directory
Merge pull request #1143 from betawax/composer-readme

Update Composer installation instructions
#1141: Updated changelog
Finalize implementing box-project.

These changes fix https://github.com/kherge-archive/Box/issues/64
(in combination with box 2.4.4) and provide phpDocumentor with the
capabilities to generate phar files using box-project.