Start versioning composer.lock and use it for CS/SA analysis on CI

.gitattributes

@@ -6,3 +6,4 @@
 .travis.yml export-ignore
 phpmd.xml.dist export-ignore
 phpunit.xml.dist export-ignore
+composer.lock export-ignore

.gitignore

@@ -1,5 +1,4 @@
 phpunit.xml
-composer.lock
 build
 vendor
 coverage.clover

.travis.yml

@@ -9,9 +9,11 @@ php:
 
 before_install:
   - mv ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/xdebug.ini{,.disabled} || echo "xdebug not available"
-  - composer self-update
+  - travis_retry composer self-update
 
-install: travis_retry composer update --prefer-dist
+install:
+  - rm composer.lock
+  - travis_retry composer update --prefer-dist
 
 script:
   - ./vendor/bin/phpunit -v
@@ -26,23 +28,24 @@ jobs:
       script:
         - ./vendor/bin/phpunit -v --coverage-clover ./build/logs/clover.xml
       after_script:
-        - wget https://scrutinizer-ci.com/ocular.phar
-        - php ocular.phar code-coverage:upload --format=php-clover build/logs/clover.xml
+        - travis_retry wget https://scrutinizer-ci.com/ocular.phar
+        - travis_retry php ocular.phar code-coverage:upload --format=php-clover build/logs/clover.xml
 
     - stage: Coding Standard
       php: 7.1
+      install: travis_retry composer install --prefer-dist
       script: ./vendor/bin/phpcs
 
     - stage: Static Analysis
       php: 7.1
-      install: composer require "phpstan/phpstan:^0.9.2" --dev
+      install: travis_retry composer install --prefer-dist
       script:
         - ./vendor/bin/phpstan analyse -c phpstan.neon -l max src
         - ./vendor/bin/phpstan analyse -c phpstan.tests.neon -l max tests
 
     - stage: Benchmark
       php: 7.1
-      install: composer require "phpbench/phpbench:^0.13.0" --dev
+      install: travis_retry composer require "phpbench/phpbench:^0.13.0" --dev
       script: php -n ./vendor/bin/phpbench run --iterations=3 --warmup=1 --report=aggregate
 
 cache:

composer.json

@@ -22,6 +22,7 @@
         "ext-phar":                  "*",
         "ext-pdo":                   "*",
         "doctrine/coding-standard":  "^4.0",
+        "phpstan/phpstan-shim":      "^0.9.2",
         "phpunit/phpunit":           "^7.0"
     },
     "autoload": {