Modification in term app

**Modification**
* Term instances are now topic instances as well.
* ATLAS group name changed and made in small caps as "atlas"
* Term details view now redirects to topic details view, which wil helps us to define and create a dependency using graph, since currently only Topic has the graph context to be displayed. Currently there is a concept graph available which defines the concepts. 
* script also modified according to the changes mentioned. while creating each term instance now topic ST is also added in member_of list of that term node.