Improved cURL transport

Tested on:
Windows 7 64bits
Apache 2.4.6 64-bits
php 5.5.4 64-bits
neo4j Community 2.0.0 Milestone 5

Everything was running on localhost. Default settings for Neo4j server.

Transfers were incredibly slow 1 or 2 seconds. While Neo4j web admin and direct curl console commands showed speeds like 20ms. Turned out that php curl first looks for IPv6. Disabling this search significantly speeds up database access. Source: http://stackoverflow.com/a/11146481
Merge pull request #89 from flip111/patch-2

I'm not seeing a lot of improvement in my own benchmarks (I wasn't seeing the bad transfer times either,) but I may be on a network that understands IPv6. I'll merge this, because IPv6 support is still janky everywhere, and this will at least eliminate one possible point of performance impact.