Simplifies the VC projects by using gmock-all.cc and

gmock_all_test.cc.  Also fixes a missing include directory for
gmock_main in the Release mode.  I had to add /bigobj to
gmock_test.vcproj to make the compiler happy, as we now need to
generate code for many functions in the same translation unit.

msvc/gmock_main.vcproj

@@ -170,7 +170,7 @@
 					>
 					<Tool
 						Name="VCCLCompilerTool"
-						AdditionalIncludeDirectories=""
+						AdditionalIncludeDirectories="../include"
 					/>
 				</FileConfiguration>
 			</File>