Proxy Support #2

After some testing, the proxy support in release 1.0.9 work in some but not all scenarios. The proxy support has been rewritten and tested to work in the environments we are targeting. The proxy is now configured in one place similarly to the New Relic .NET Agent:

<!-- Proxy settings for connecting to the New Relic service. -->
<!-- If a proxy is used, the host attribute is required.

    Attributes:
    host - The proxy server host name.
    port - The proxy server port (optional - defaults to 8080).
    user - The username used to authenticate with the proxy server (optional).
    password - The password used to authenticate with the proxy server (optional).
    domain - The domain used to authenticate with the proxy server (optional).
    useDefaultCredentials - 'true' or 'false. Uses the credentials of the account running the plugin (optional - defaults to false).
                            If specified, 'user' and 'password' are ignored.
-->

<!--
<proxy host="hostname" />
-->

Please let us know if you have any problems with your proxy or preparing the configuration file for your environment.

Also, this release fixes an 'Invalid column name' bug that a few of you were seeing.