CMake 2.8.5 or higher is required

make with error for the lower version:

Linking CXX executable ../../bin/jsoncpp_test
/bin/sh: $<TARGET_FILE:jsoncpp_test>: command not found
make[2]: *** [bin/jsoncpp_test] Error 127
make[1]: *** [src/test_lib_json/CMakeFiles/jsoncpp_test.dir/all] Error 2
make: *** [all] Error 2

due to 
http://stackoverflow.com/questions/5410164/how-do-i-use-a-targets-path-in-add-custom-command-in-cmake#comment6139682_5410794
Merge pull request #50 from sergzub/master

 CMake 2.8.5 or higher is required
Added printing of comments to *.actual test files

This enables testing of comment-handling code. Updated *.expected test
result files to account for printing of comments.
Removed unneeded newlines from parsed comments

Newlines from comments separated by lines are retained when comments
are appended, so adding a newline between separate comments for a
node is not needed.
Merge pull request #52 from cquammen/master

Removed unneeded newlines from parsed comments
Removed typo in README
Merge pull request #53 from I3ck/master

Removed typo in README
Updated documentation links to point to GitHub
Merge pull request #54 from I3ck/master

Updated documentation links to point to GitHub
use the CXXFLAGS and LINKFLAGS environment variable in scons

this allows homebrew to use its own flags during the build
Merge pull request #55 from glehmann/build-env

use the CXXFLAGS and LINKFLAGS environment variable in scons
Add public semantic error reporting
Closes open-source-parsers/jsoncpp#57
Merge pull request #58 from autochthe/master

Add public semantic error reporting
Update README.md

Note on C++11
Allow customization of component install dirs
Add CMake package file generation support
Fix default runtime install dir
Merge pull request #63/#67 from dreifachstein/master

Allow customization of component install dirs
Passed Travis CI.
Remove initInt and initUInt until they are needed.
Merge pull request #68 from BillyDonahue/refactor_ctor_boilerplate

Json::Value: Refactor common code in all constructors to an initBasic() function.