ImageBox's image will reload when error happens.
Bug fix in render_formula.
Change BasicEntity to BasicComponent.
Replace ImageBox class with MultiRowComponent and LatexCodeImage class.
Fix 'constuctor' to 'constructor' in SelectRow and SelectRowOrColumn.
Adjust radius of TargetGate and Control.
Revert "Adjusted APIs about SelectRowOrColumn"

This reverts commit a4de683355d61dbc3a9f31b077c84e216e9cb58f.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	app/assets/javascripts/qcircuit_editing/helper.js.coffee