Added annotate models
Added annotate models and added paper trial for tracking the history of the changes done to the models and who has done that.
Master data Model created with Assosiation.
Removed Will paginate as it is conflicting with rails admin. Please use kaminari gem.
Added rails_admin, paper_trail and annotate gems
Mounted rails admin routes
Annotated to display table columns in each file.
Added migrations for rails admin, paper trail and models - zone, center and sector.
Added Gemlock file as we don't need to commit this.
Merged from MasterDataUI

Signed-off-by: abhisek <abhisek.datta@gmail.com>
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Signed-off-by: abhisek <abhisek.datta@gmail.com>