Rename period things

[izumin5210]

related #56, #68

TODO

Phase 1: Period → PeriodTime

• [x] rename table
• [x] rename class name, factory names and file names
  • [x] model
  • [x] spec
  • [x] factory
  • [x] decorator
• [x] fix failure specs

  Phase 2: WdayPeriod → Period

• [x] rename table
• [x] rename class name, factory names and file names
  • [x] model
  • [x] spec
  • [x] factory
• [x] fix failure specs

[coveralls]

Coverage decreased (-16.09%) to 80.0% when pulling 6628e21e445bfc7b621025589f89c0736ed9032b on rename-period-things into 3a19a0820dc45c95d4f19fa9861d6407ea786930 on master.

[coveralls]

Coverage remained the same at 96.09% when pulling da5d424434007d81ca9a8e450733111a7cfcfcce on rename-period-things into 3a19a0820dc45c95d4f19fa9861d6407ea786930 on master.

[coveralls]

Coverage remained the same at 96.09% when pulling 3154982ec54f4e8815556a86d7e054ef541d81d1 on rename-period-things into 3a19a0820dc45c95d4f19fa9861d6407ea786930 on master.

[izumin5210]

やば masterにだしてしまっていた…