Move skill order list for a boss battle.
Move skill order list for arena.
Move skill order lists from core namespace.

This merge moves skill order lists from core namespace which includes
common data and functions. This merge is for difference between skill
order of a boss battle and it of arena.
Change core library for boss battle simulation.
Merge core libraries.
Add skill type checker to common namespace.
Move summers.
Merge core libraries.
Rename IDs.
Add navbars.
Adjust navbar layouts.
Add navbars.
Fix markup errors.
Simplify a css.
Update README.
Update CHANGELOG.
20141117

- アリーナにおけるスキルの優先順位を変更