Example Tag Assembler and Descriptor + Registration.
Scrutinizer/Travis Fixes.
Support for Inline.
Moved Example resolution from ExampleTag to ExampleAssembler.
Replace Inline Examples inside of <pre> not <pre {scrollable}>

I originally put them in scrollables to account for large examples, but Inline Examples shouldn't be that large, so a simple <pre> should be fine.
Scrutinizer Cleanup.
Added optional use of igbinary if installed
Update ServiceProvider.php
Added missing import
Update ProjectDescriptorMapper.php
Update ProjectDescriptorMapper.php

@mvriel This sounds strange to me because it is working on my project i had tests with. But if the project descriptor is not populated with data my first version just overwritten the cache with empty values then? so maybe it will be better to clear the cache if the value couldnot be unserialized. what do you think?
Update ProjectDescriptorMapper.php
Change definition of summary/description break

In this commit I have made the following documentation changes:

- Changed short description to summary
- Changed long description to description
- Changed example mail address
- Changed definition when a summary breaks and becomes a description
  to match PSR-5 and actual usage.
Integrated code review feedback
Add tests for Descriptor\ProjectDescriptor
Implemented TestFest 'Descriptor\Validator' case
- Added PHPUnit test for Descriptor\Validator\Error at the TestFest
- Added docblocks for Descriptor\Validator\Error
- Fixed typo in Descriptor/CollectionTest
Forgot trailing newline
add test for FileDescriptor.php
Added partial unit tests
Unittests for Core\descriptor\Validator\Constraint\Classes

Written during amsterdamPHP TestFest
I've written 4 Unit Tests
I left out HasSinglePackageWithSubpackageValidator and
HasSingleSubpackageValidator