Add cURLpp to project

cURLpp is now compiled in test configuration, curl needs to be correctly installed and LoadcURLpp script should be executed first
Implemented sendRequest function

this function matches sendRequest_t signature and can be used for testing
Tests for sendRequest function added
Modify sendRequest and tests to work with modified httpRequest
Determination of test executable extension fixed

Algorithm, that is used for forming extension of executable, that is started each time after test build, fixed. Now exe is added only for win32, instead of anything, except posix.
Merge pull request #14 from swat32exe/add-send-request

Implement sendRequest function with dependencies