Added info for extra camera (Canon Ixus 240 HS)

http://snapsort.com/cameras/Canon-240-HS-specs/sensor-size-sane JHead output: Camera make : Canon Camera model : Canon IXUS 240 HS
2016-01-24 18:43:57 +02:00 · 2016-01-24 18:43:57 +02:00 · ce21697753
commit ce21697753
--- a/ccd_defs.json
+++ b/ccd_defs.json
@ -1,6 +1,7 @@
 {
  "Apple iPhone 5s": 8.46,
  "Asahi Optical Co.,Ltd.  PENTAX Optio330RS": 7.176,
+  "Canon Canon IXUS 240 HS": 6.17,
  "Canon Canon DIGITAL IXUS 400": 7.176,
  "Canon Canon DIGITAL IXUS 40": 5.76,
  "Canon Canon DIGITAL IXUS 430": 6.18,