Renamed to zend-diactoros / Zend\Diactoros

Diactoros: epithet of Hermes, meaning literally, "the messenger".

Namespaces become:

- src: `Phly\Http` -> `Zend\Diactoros`
- test: `PhlyTest\Http` -> `ZendTest\Diactoros`

License docblocks were added to all source files. All references to the old
package name and/or namespace were rewritten to the new values.

Author: weierophinney

.travis.yml

@@ -5,7 +5,6 @@ language: php
 matrix:
   fast_finish: true
   include:
-    - php: 5.4
     - php: 5.5
     - php: 5.6
       env:
@@ -27,7 +26,7 @@ before_script:
 script:
   - if [[ $EXECUTE_COVERAGE == 'true' ]]; then ./vendor/bin/phpunit --coverage-clover=coverage.clover ; fi
   - if [[ $EXECUTE_COVERAGE != 'true' ]]; then ./vendor/bin/phpunit ; fi
-  - if [[ $EXECUTE_CS_CHECK == 'true' ]]; then ./vendor/bin/phpcs --standard=PSR2 --ignore=test/Bootstrap.php src test ; fi
+  - if [[ $EXECUTE_CS_CHECK == 'true' ]]; then ./vendor/bin/phpcs --standard=PSR2 src test ; fi
 
 after_script:
   - if [[ $EXECUTE_COVERAGE == 'true' ]]; then wget https://scrutinizer-ci.com/ocular.phar ; fi