added EditorView declaration to atom/atom.d.ts
improve AtomCore.ISelection definition in atom/atom.d.ts
improve AtomCore.IPointStatic and AtomCore.IPoint definition in atom/atom.d.ts
improve AtomCore.IRangeStatic and AtomCore.IRange in atom/atom.d.ts
improve AtomCore.IDisplayBufferMarkerStatic and AtomCore.IDisplayBufferMarker in atom/atom.d.ts
improve AtomCore.IDisplayBufferStatic and AtomCore.IDisplayBuffer in atom/atom.d.ts
Merge pull request #2135 from vvakame/improve-atom-definition

Improve atom definition