move to psr4 and minor adjustments
fix some typos
Exclude /vendor
Added logo for koinos library (400px).
Moved Symfony-specific files to separate bundle.
Moved tests to standard location in /tests
Updated namespacing for Koinos library (not bundle).
Switched to PSR4 and revised structure
Now a PHP library, not a Symfony Bundle (to be created separately).
Merge pull request #6 from eukras/pr/1

Pr/1