Add CI tools and repo configuration

Author: shulard

.editorconfig

@@ -0,0 +1,12 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 4
+indent_style = space
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.yml*]
+indent_size = 2

.gitattributes

@@ -0,0 +1,7 @@
+.editorconfig    export-ignore
+.gitattributes   export-ignore
+.gitignore       export-ignore
+.scrutinizer.yml export-ignore
+.travis.yml      export-ignore
+CONTRIBUTING.md  export-ignore
+CONDUCT.md       export-ignore

.gitignore

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+build/
+vendor/
+composer.lock

.scrutinizer.yml

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+filter:
+  paths: [src/*]
+checks:
+  php:
+    code_rating: true
+    duplication: true
+tools:
+  external_code_coverage: true
+  php_code_sniffer:
+    config:
+      standard: "PSR2"

.travis.yml

@@ -0,0 +1,39 @@
+language: php
+
+sudo: false
+
+cache:
+  directories:
+    - $HOME/.composer/cache
+
+php:
+  - 5.4
+  - 5.5
+  - 5.6
+  - 7.0
+  - hhvm
+
+env:
+  global:
+    - TEST_COMMAND="composer test"
+
+matrix:
+  allow_failures:
+    - php: 7.0
+  fast_finish: true
+  include:
+    - php: 5.4
+      env: COMPOSER_FLAGS="--prefer-stable --prefer-lowest" COVERAGE=true TEST_COMMAND="composer test-ci"
+
+before_install:
+  - travis_retry composer self-update
+
+install:
+  - travis_retry composer update ${COMPOSER_FLAGS} --prefer-source --no-interaction
+
+script:
+  - $TEST_COMMAND
+
+after_success:
+  - if [[ "$COVERAGE" = true ]]; then wget https://scrutinizer-ci.com/ocular.phar; fi
+  - if [[ "$COVERAGE" = true ]]; then php ocular.phar code-coverage:upload --format=php-clover build/coverage.xml; fi