Fix version numbers in config.hh

[caguero]

Fix version numbers in config.hh. Before:

/* Version number */
#define IGNITION_SENSORS_MAJOR_VERSION 
#define IGNITION_SENSORS_MINOR_VERSION 
#define IGNITION_SENSORS_PATCH_VERSION 

#define IGNITION_SENSORS_VERSION "4.0"
#define IGNITION_SENSORS_VERSION_FULL "4.0.0~pre1"

#define IGNITION_SENSORS_VERSION_NAMESPACE v4

#define IGNITION_SENSORS_VERSION_HEADER "Ignition Sensors, version 4.0.0~pre1\nCopyright (C) 2014 Open Source Robotics Foundation.\nReleased under the Apache 2.0 License.\n\n"

/* #undef BUILD_TYPE_PROFILE */
/* #undef BUILD_TYPE_DEBUG */
/* #undef BUILD_TYPE_RELEASE */

#define IGN_SENSORS_PLUGIN_PATH "/usr/lib/x86_64-linux-gnu"
#define IGN_SENSORS_PLUGIN_NAME(name) std::string("ignition-sensors4-")+name

After:

/* Config.hh. Generated by CMake for ignition-sensors. */

/* Version number */
#define IGNITION_SENSORS_MAJOR_VERSION 2
#define IGNITION_SENSORS_MINOR_VERSION 9
#define IGNITION_SENSORS_PATCH_VERSION 0

#define IGNITION_SENSORS_VERSION "2.9"
#define IGNITION_SENSORS_VERSION_FULL "2.9.0"

#define IGNITION_SENSORS_VERSION_NAMESPACE v2

#define IGNITION_SENSORS_VERSION_HEADER "Ignition Sensors, version 2.9.0\nCopyright (C) 2014 Open Source Robotics Foundation.\nReleased under the Apache 2.0 License.\n\n"

/* #undef BUILD_TYPE_PROFILE */
/* #undef BUILD_TYPE_DEBUG */
/* #undef BUILD_TYPE_RELEASE */

#define IGN_SENSORS_PLUGIN_PATH "/usr/lib/x86_64-linux-gnu"
#define IGN_SENSORS_PLUGIN_NAME(name) std::string("ignition-sensors2-")+name

[codecov]

Codecov Report

Merging #42 into ign-sensors2 will not change coverage.
The diff coverage is n/a.

@@              Coverage Diff              @@
##           ign-sensors2      #42   +/-   ##
=============================================
  Coverage         79.99%   79.99%           
=============================================
  Files                21       21           
  Lines              2059     2059           
=============================================
  Hits               1647     1647           
  Misses              412      412           

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