Suggested friends parameter is loaded from a .properties file

**Summary:** The suggested friends parameter for common followers amount is loaded from a .properties file now.
Merge branch 'friends-in-common-fix'

Conflicts:
	Sprint3/src/main/java/ar/edu/itba/it/paw/web/user/SuggestedFriendsPage.java
	Sprint3/src/main/java/ar/edu/itba/it/paw/web/user/SuggestedFriendsPage.properties
The application checks if the deleter of a comment is the commenter

**Summary:** A validation has been added on the delete comment method to avoid another user delete a comment that hasn't been written by him.