PHPStan: document run parameters in project ruleset (#122)

This makes it easier to run the PHPStan command for the project.

Includes:
* Using `%currentWorkingDirectory%` instead of `%rootdir%`
* Renaming the file to `phpstan.neon.dist` to allow overloading of the config by individual developers.

Author: jrfnl

composer.json

@@ -31,7 +31,7 @@
     "scripts": {
         "test": "./vendor/bin/phpunit",
         "lint": "./vendor/bin/phpcs",
-        "phpstan": "./vendor/bin/phpstan analyse -l 7 VariableAnalysis"
+        "phpstan": "./vendor/bin/phpstan analyse"
     },
     "require" : {
         "php" : ">=5.6.0",

phpstan.neon

@@ -0,0 +1,10 @@
+parameters:
+  level: 7
+  autoload_files:
+    - %currentWorkingDirectory%/vendor/squizlabs/php_codesniffer/autoload.php
+  paths:
+    - %currentWorkingDirectory%/VariableAnalysis/
+  excludes_analyse:
+    - %currentWorkingDirectory%/VariableAnalysis/Tests/
+  ignoreErrors:
+    - '~^Constant T_\w+ not found.$~'