Feature/offset

[coord-e]

Fix #22

[todo]

ignore this with warning

servoarray/src/lib/servoarray.cpp

Lines 34 to 39 in 983a01f

	// TODO: ignore this with warning
	throw std::runtime_error("Offset index out of range");
	}
	this->offsets_[p.first] = p.second;
	}

---

This comment was generated by todo based on a TODO comment in 983a01f in #26. cc @MonoMotion.