Added attributes info to note show (inside META part)

This commit permits to see the **URL** and the **source** of the note (and subjectDate, latitude, longitude, altitude, author, source, sourceURL, sourceApplication, shareDate, reminderOrder, reminderDoneTime, reminderTime, placeName, contentClass, applicationData, lastEditedBy, classifications, creatorId, lastEditorId).

**The values ​​are displayed only if they are not empty.**

*Example :*
```
jer@j:~$ geeknote show 61
################## TITLE ##################
Added attributes info to note show (inside META part) by jersou · Pull Request #199 · VitaliyRodnenko/geeknote
=================== META ==================
Created: 14/06/2014 09:44
Updated: 14/06/2014 09:44
sourceURL: https://github.com/VitaliyRodnenko/geeknote/pull/199
source: Clearly
----------------- CONTENT -----------------
  Added attributes info to note show (inside META part) #199

[ jersou ](https://github.com/jersou) wants to merge 1 commit into
VitaliyRodnenko:master from jersou:master
```