Update README.md
Fix cygwin-gcc and cmake problems

Fixed warning in CMake
Fixed problem with tuples creation
Fixed problem of stream copy constructor usage
Merge pull request #12 from jbaltie/compile/cygwin-gcc

Fix cygwin-gcc and cmake problems
Merge branch 'release/0.25'

Conflicts:
	test_constraints/CMakeLists.txt
Merge tag '0.25' into develop

Fixes for gcc-4.8 under cygwin 64bit
eval commodity function for sending commands to the database and getting the return value back
Added alias method to wrapped values so that you can select constant values