title: SharedPreferences sent by ACRA are all empty
body: <p>I followed the manual for implementing SharePreferences capture inside ACRA. What I basically did was including the following line in the configuration (is one of the lines of the complete configuration:</p>
  
  <pre><code>  customReportContent = { APP_VERSION, 
                         ANDROID_VERSION,
                         SHARED_PREFERENCES }
    additionalSharedPreferences={"EXTRA_MESSAGE","NOTIF_ACTIVATED"}
  </code></pre>
  
  <p>I followed the information from <a href="https://github.com/ACRA/acra/wiki/AdvancedUsage#adding-custom-sharedpreferences-names" rel="nofollow">this manual</a> and the details <a href="https://github.com/ACRA/acra/wiki/ReportContent#shared_preferences" rel="nofollow">on this one</a> .</p>
  
  <p>However, all the preferences I received in my Cloudant database appear as empty. I made sure that ALL variables are not the default variables, specially on this 2 ones, which are changed earlier in the configuration, I tricked my code just before the message changing intentionally those variables. But, I am still receiving empty values.</p>
  
  <p>I order to double check I included the email option to check what data was written by ACRA, also filling the field empty. The evidences I have:
  - Report at Clound Ant with SharedPreferences are empty.
  - The email text introduced by ACRA and offered to the user is also having the field as "empty".
  - No error output from ACRA in any operation</p>
  
  <p>After investigating during the morning I am blocked and I don't know what else to do.</p>
  
  <p>SDK21 and ACRA4.5.0 using a 2.3 android mobile.</p>