Add support for calling API over proxy.
Fix indentation
Add support for calling API over proxy.
Fix indentation
Implementing proxy support
Merge remote-tracking branch 'origin/proxy-support' into proxy-support

Conflicts:
	src/main/java/com/urbanairship/api/client/APIClient.java
Refactored proxyhost/proxycredentials setting to allow caller defined
proxy authentication to be used.
Fix indentation
Refactor implementation; Unit tests
Update toString(), add equals() and hashcode()
Merge pull request #23 from urbanairship/proxy-support

Proxy support 2