Drop support for Numpy 1.12. (pydata#84)

* Add tests for scipy spmatrices from the left.

* Fix failing tests.

* Update docs.

* Add back pure Python abs support.

* Drop Scipy op support

* Add Scipy sparse support back.

* Update docs.

* Remove most .ufunc calls since Numpy doesn't have them.

* Update docs.

Author: hameerabbasi

docs/generated/sparse.COO.abs.rst

@@ -6,7 +6,7 @@ COO
 .. autoclass:: COO
 
    .. note::
-      :obj:`COO` objects also support :doc:`operators <../user_manual/operations/basic>`
+      :obj:`COO` objects also support :doc:`operators <../user_manual/operations/operators>`
       and :doc:`indexing <../user_manual/operations/indexing>`
 
    .. rubric:: Attributes
@@ -33,22 +33,8 @@ COO
       :toctree:
 
       COO.elemwise
-      COO.abs
       COO.astype
-      COO.ceil
-      COO.conj
-      COO.conjugate
-      COO.exp
-      COO.expm1
-      COO.floor
-      COO.log1p
-      COO.rint
       COO.round
-      COO.sin
-      COO.sinh
-      COO.sqrt
-      COO.tan
-      COO.tanh
 
    .. rubric:: :doc:`Reductions <../user_manual/operations/reductions>`
    .. autosummary::