version bump
- fixed a potential memory leak in Poco::Net::HTTPClientSession if it is misused
  (e.g., sendRequest() is sent two times in a row without an intermediate call to
  receiveResponse(), or by calling receiveResponse() two times in a row without
  an intermediate call to sendRequest()) - GH #217
- removed a few unnecessary protected accessor methods from Poco::Net::HTTPClientSession
  that would provide inappropriate access to internal state
updated changelog
Merge pull request #216 from mkrivos/small_fixes

version bump for cmake
GH #151: Bug compiling Poco 1.4.6p1 with Visual Studio Express
fixed GH #218: VS2010 doesn't build ipaddress.cpp current develop
Merge remote-tracking branch 'upstream/develop' into develop