Use lowercase for cmake commands consistenly

Inspired from https://github.com/InsightSoftwareConsortium/ITK/blob/master/Utilities/Maintenance/HowToCreateTheCMakeCaseConversion.txt
This needs vim 7.3 and fails with vim 7.4

This also fixes a number of :
- missing empty line at end of files
- useless space at end of lines

cmake/EnsureFileInclude.cmake

@@ -1,5 +1,5 @@
 # Ensure that an include file is provided by the system
-# Add the check about the mandatory status to the check_include_file macro 
+# Add the check about the mandatory status to the check_include_file macro
 # provided by cmake
 
 include (${CMAKE_ROOT}/Modules/CheckIncludeFile.cmake)
@@ -23,4 +23,4 @@ if (NOT ${${VARIABLE_NAME}})
   endif()
 endif()
 
-endmacro()
+endmacro()