Add phar support

### Added
- support to build phar using `box-project/box2`
- support to provide certificate bundle via temporary file to avoid curl issue when using phar, see (https://bugs.php.net/bug.php?id=69035) for further details
- support to create phar during travis build and attach it to release

.travis.yml

@@ -10,10 +10,23 @@ before_script:
 # In case of timeouts and build failures you may want to prepend 'travis_retry' to the following commands:
   - curl -s http://getcomposer.org/installer | php
   - php composer.phar install -n
+  - wget -O box.phar https://github.com/box-project/box2/releases/download/2.7.5/box-2.7.5.phar
 
 # Explicitly use the phpunit from composer, not any system-wide found
 script: 
   - php vendor/bin/phpunit --coverage-clover build/coverage/xml tests
 
 after_success:
   - php vendor/bin/codacycoverage clover build/coverage/xml
+
+before_deploy:
+  - php -d phar.readonly=0 box.phar build && chmod +x build/codacy-coverage.phar
+
+deploy:
+  provider: releases
+  skip_cleanup: true
+  api_key:
+    secure: <api-key>
+  file: build/codacy-coverage.phar
+  on:
+    tags: true

README.md

@@ -15,6 +15,12 @@
 
 # Installation
 
+Setup codacy-coverage as phar, you can simply download a pre-compiled and ready-to-use version as a phar to any directory. Simply download the latest `codacy-coverage.phar` file from our [releases page](https://github.com/codacy/php-codacy-coverage/releases):
+
+[Latest release](https://github.com/codacy/php-codacy-coverage/releases/latest)
+
+That's it already.
+
 Setup codacy-coverage with Composer, just add the following to your composer.json:
 
 ```js

box.json

@@ -0,0 +1,9 @@
+{
+    "directories": [
+        "src",
+        "vendor"
+    ],
+    "main": "bin/codacycoverage",
+    "output": "build/codacy-coverage.phar",
+    "stub": true
+}

src/Codacy/Coverage/Util/CodacyApiClient.php

@@ -25,9 +25,12 @@ function __construct($baseUrl, $projectToken)
      */
     public function sendCoverage($commit, $data)
     {
+        $tempCertFile = $this->dumpCertificateBundle();
+
         $url = $this->baseUrl . "/2.0/coverage/" . $commit . "/php";
 
         $curl = curl_init($url);
+
         curl_setopt($curl, CURLOPT_HEADER, false);
         curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
         curl_setopt(
@@ -37,12 +40,14 @@ public function sendCoverage($commit, $data)
                 "project_token: " . $this->projectToken
             )
         );
-        curl_setopt($curl, CURLOPT_CAINFO, dirname(__FILE__) . '/cacert.pem'); 
+        curl_setopt($curl, CURLOPT_CAINFO, $tempCertFile); 
         curl_setopt($curl, CURLOPT_POST, true);
         curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
 
         $json_response = curl_exec($curl);
 
+        unlink($tempCertFile);
+
         $status = curl_getinfo($curl, CURLINFO_HTTP_CODE);
 
         if ($status < 200 || $status > 201) {
@@ -63,4 +68,18 @@ public function sendCoverage($commit, $data)
             return $json['error'];
         }
     }
+
+    /**
+     * Store certificate bundle to temporary file to be available when used within phar context
+     * 
+     * @return string Full qualified path to temporary file
+     */
+    protected function dumpCertificateBundle()
+    {
+        $tempCertFile = tempnam(sys_get_temp_dir(), 'cacert');
+
+        copy(dirname(__FILE__) . '/cacert.pem', $tempCertFile);
+
+        return $tempCertFile;
+    }
 }