MIFOSX-1602 - Include MifosX Release Date and Version as About info

Now we have release date and version are displayed in About.html page. :)
'About' is availble as drop-down main menu position and in left navi-menu.
About page includes a bit modified informations and MifosX logo from index page, for release date and version info are used two variables in MainController and localization file.
What do you think about it? Is there something what I could improve?
Thanks,
Screen:
![about_01](https://cloud.githubusercontent.com/assets/10184394/5564583/a14ad352-8ec9-11e4-8cc8-44d8b5ee5fd9.png)
![about_02](https://cloud.githubusercontent.com/assets/10184394/5564586/aeca6bfa-8ec9-11e4-8607-5e7427bb0ba1.png)
![about_03](https://cloud.githubusercontent.com/assets/10184394/5564588/b53fb85a-8ec9-11e4-9eec-c75b8daf3ec5.png)