Using HTTParty to download the neo4j archive on non-Windows systems instead of wget
Fixed issue with rake neo4j:install on windows
Removed the -z switch from the tar command since the file which gets downloaded, now, has a file type of a POSIX tar archive
Merge pull request #64 from ausmarton/rake-neo4j-fix

Fixing the neo4j:install rake task for systems without wget and Windows