Update cURL to latest version and protect it against Heartbleed

deleted:    bin/curl.exe
new file:   bin/curl.bat
new file:   bin/curl/curl.exe
new file:   bin/curl/libeay32.dll
new file:   bin/curl/libssh2.dll
new file:   bin/curl/ssleay32.dll
modified: setup/Gow.nsi
* Updated cURL to 7.36.0
* Updated cURL's OpenSSL to 1.0.1g
* Solved DLL conflicts with other binaries
* Enable the installer scripts to package directories also