Feature/seed task

[sue445]

rake heart_seed:db:seed                 # Load the seed data from db/seeds/*.yml (options: TABLES=table1,table2 CATALOGS=catalog1,catalog2)
rake heart_seed:init                    # create dir and file
rake heart_seed:xls                     # create seed files by xls directory (options: FILES=table1.xls,table2.xlsx SHEETS=sheet1,sheet2)

[coveralls]

Coverage decreased (-0.41%) when pulling 9bc3a71 on feature/seed_task into 2cf3afc on master.