Merge pull request #3 from swat32exe/add-rsa-sha1-signature-melzas

Make buildable under windows
Use conditional compilation for openssl/applink.c and add libcrypto

openssl/applink.c is needed only on Windows
Fix possible memory leaks and change exception messages
Add Service tests for RSA-SHA1 signature
Fix path problem

now SCons should use system PATH variable
Fix HttpRequest includes