Fix NullPointerException and add some test cases
Use ImageUtils statically
Private
Update ImageUtilsTest.java

Removing redundant property
Remove unnecessary code
Merge branch 'issues/76' of github.com:buddycloud/buddycloud-media-server into issues/76

Conflicts:
	src/test/java/com/buddycloud/mediaserver/business/util/ImageUtilsTest.java
Merge pull request #77 from buddycloud/issues/76

Fix NullPointerException and add some test cases