Also set the version for the CMake build

Otherwise the installed pkgconfig files are broken. The release script
has also been changed to update the version for CMakeLists.txt.

Fixes issue #162

c++/CMakeLists.txt

 project("Cap'n Proto" CXX)
 cmake_minimum_required(VERSION 2.8)
+set(VERSION 0.6-dev)
 
 set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
 

release.sh

@@ -37,6 +37,7 @@ update_version() {
 
   local OLD_REGEX=${OLD//./[.]}
   doit sed -i -e "s/$OLD_REGEX/$NEW/g" c++/configure.ac
+  doit sed -i -e "s/set(VERSION.*)/set(VERSION $NEW)/g" c++/CMakeLists.txt
 
   local NEW_NOTAG=${NEW%%-*}
   declare -a NEW_ARR=(${NEW_NOTAG//./ })