title: Error to install mongodb in lumen
body: <p>I use Lumen micro framework on ubuntu 14.4,when i want to install monogodb packege form <a href="https://github.com/jenssegers/laravel-mongodb" rel="nofollow">this link</a> i got a error like below:</p>
  
  <pre><code>Your requirements could not be resolved to an installable set of packages.
  
  Problem 1
  - jenssegers/mongodb v3.0.0 requires mongodb/mongodb ^1.0.0 -&gt; satisfiable by mongodb/mongodb[1.0.0, 1.0.1].
  - jenssegers/mongodb v3.0.1 requires mongodb/mongodb ^1.0.0 -&gt; satisfiable by mongodb/mongodb[1.0.0, 1.0.1].
  - jenssegers/mongodb v3.0.2 requires mongodb/mongodb ^1.0.0 -&gt; satisfiable by mongodb/mongodb[1.0.0, 1.0.1].
  - mongodb/mongodb 1.0.1 requires ext-mongodb ^1.1.0 -&gt; the requested PHP extension mongodb is missing from your system.
  - mongodb/mongodb 1.0.0 requires ext-mongodb ^1.1.0 -&gt; the requested PHP extension mongodb is missing from your system.
  - Installation request for jenssegers/mongodb ^3.0 -&gt; satisfiable by jenssegers/mongodb[v3.0.0, v3.0.1, v3.0.2].
  
  To enable extensions, verify that they are enabled in those .ini files:
  - /etc/php5/cli/php.ini
  - /etc/php5/cli/conf.d/05-opcache.ini
  - /etc/php5/cli/conf.d/10-pdo.ini
  - /etc/php5/cli/conf.d/20-curl.ini
  - /etc/php5/cli/conf.d/20-gd.ini
  - /etc/php5/cli/conf.d/20-json.ini
  - /etc/php5/cli/conf.d/20-mcrypt.ini
  - /etc/php5/cli/conf.d/20-mysql.ini
  - /etc/php5/cli/conf.d/20-mysqli.ini
  - /etc/php5/cli/conf.d/20-pdo_mysql.ini
  - /etc/php5/cli/conf.d/20-readline.ini
  - /etc/php5/cli/conf.d/mongo.ini
  You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode.
  
  Installation failed, reverting ./composer.json to its original content.
  </code></pre>
  
  <p>How can i fix it?</p>