initial check-in of arduino docs in RST format (converted using wget+pandoc)

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+.. _arduino-incrementcompound:
+
++= , -= , \*= , /=
+==================
+
+Description
+-----------
+
+Perform a mathematical operation on a variable with another
+constant or variable. The += (et al) operators are just a
+convenient shorthand for the expanded syntax, listed below.
+
+
+
+Syntax
+------
+
+::
+
+    x += y;   // equivalent to the expression x = x + y;
+    x -= y;   // equivalent to the expression x = x - y; 
+    x *= y;   // equivalent to the expression x = x * y; 
+    x /= y;   // equivalent to the expression x = x / y; 
+
+
+
+Parameters
+----------
+
+x: any variable type
+
+
+
+y: any variable type or constant
+
+
+
+Examples
+--------
+
+::
+
+    x = 2;
+    x += 4;      // x now contains 6
+    x -= 3;      // x now contains 3
+    x *= 10;     // x now contains 30
+    x /= 2;      // x now contains 15
+
+