Merge pull request #193 from sbillinge/constructor

DiffractionObject can now be instantiated directly

Author: sbillinge

Diff for: news/constructor.rst

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+**Added:**
+
+* <news item>
+
+**Changed:**
+
+* arrays and attributes now can be inserted when a DiffractionObject is instantiated
+* data are now stored as a (len(x),4) numpy array with intensity in column 0, the q, then tth, then d
+* `DiffractionObject.on_q`, `...on_tth` and `...on_d` are now methods and called as `DiffractionObject.on_q()` etc.`
+
+**Deprecated:**
+
+* <news item>
+
+**Removed:**
+
+* <news item>
+
+**Fixed:**
+
+* <news item>
+
+**Security:**
+
+* <news item>