Artifactory 3.3 support with Debian release, build on Gradle 2.0

OJO build: https://oss.jfrog.org/webapp/builds/artifactory-java-client/1846586/2014-08-11T13:14:17.857+0000/?7
Bintray version: https://bintray.com/jfrog/artifactory-tools/artifactory-client-java/0.15/view

added impls of mkdir, security, permission targets, ning improvements

Merge pull request #32 from charlesk40/master

Allow AsyncHttpClient to be passed in.   Use bounded threadpool.

ning async client, better module names

Merge pull request #30 from jbaruch/master

better module names