Uploaded files in e-library are displayed according to mime type

**Feature Enhancement**

* Previously only files having attribute 'educationaluse' are displayed in E-Library
* Now files are displayed in E-Library according to mime-type as well , hence after uploading file (image, video, document or audio) it will be visible under images, audio, video or documents categories.  

**What is to test**
* upload any file (image, video, audio or document) in e-library and check after uploading its visible in resource categories or not.