Move all floats to doubles

The code was developed initially around a pid loop implemented using
floats.  Therefore, the code was converting back and forth between
double for sensor values as inputs and outputs from this PID loop.

Change-Id: I2d2919e1165103040729c9f16bb84fde3dd6b81b
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/test/zone_mock.hpp b/test/zone_mock.hpp
index 79947fb..35a6b32 100644
--- a/test/zone_mock.hpp
+++ b/test/zone_mock.hpp
@@ -12,9 +12,9 @@
     virtual ~ZoneMock() = default;
 
     MOCK_METHOD1(getCachedValue, double(const std::string&));
-    MOCK_METHOD1(addRPMSetPoint, void(float));
-    MOCK_CONST_METHOD0(getMaxRPMRequest, float());
+    MOCK_METHOD1(addRPMSetPoint, void(double));
+    MOCK_CONST_METHOD0(getMaxRPMRequest, double());
     MOCK_CONST_METHOD0(getFailSafeMode, bool());
-    MOCK_CONST_METHOD0(getFailSafePercent, float());
+    MOCK_CONST_METHOD0(getFailSafePercent, double());
     MOCK_METHOD1(getSensor, Sensor*(const std::string&));
 };