#676: Inherit 'package' in class/interface from file

The previous of phpDocumentor was that there was no link between the package
tag of the file and class. After a discussion in #676 it was decided that there was
no solid foundation to be found for the lack of inheritance.
Add Vagrant support

With this commit I add support for vagrant to setup a default development
environment. This installs a Ubuntu Precise Pangolin (64bit) box with
the necessary modules and applications to immediately start development on
phpDocumentor.

Please note that the first time you do 'vagrant up' that it will take a long
time to boot as composer needs to retrieve all dependencies.
Fix issue with minimum stability
GH-718: Missing structure file causes exception

A structure file may be absent; in which case a full run is done.
Due to an error in the refactoring for dynamic exporters was an exception thrown.
Merge branch 'develop' of github.com:phpDocumentor/phpDocumentor2 into develop
Merge branch 'develop' of github.com:phpDocumentor/phpDocumentor2 into develop
Adding @uses to the documentation and to the PSR