Merge pull request #1 from AsyncHttpClient/master

Merging from original repo on 3/28
Merge pull request #2 from AsyncHttpClient/master

Merging from main OSS
Making changes so that asynchttpclient config default values are picked up from the asynchttpclient.properties in case they are not specified via system property.
The search order for the default value for each config property is as such:
1. System Property
2. Property specified in asynchttpclient.properties
3. Default Value specified in code

Also introducing JMockit for unit testing.
Making changes so that asynchttpclient config default values are picked up from the asynchttpclient.properties in case they are not specified via system property.
The search order for the default value for each config property is as such:
1. System Property
2. Property specified in asynchttpclient.properties
3. Default Value specified in code

Also introducing JMockit for unit testing.
Make NPE message more explicit when passing a null hostname to avoid proxy, close #560, close #561
RequestBuilder.setUrl shouldn't accept an URI without a host, close #571
minor clean up, properly use NPE instead of IAE
Minor ProxyUtils.matchNonProxyHost clean up, still very incomplete
Ensure certificate verification by using a singleton.
Move setting a SSLEngineFactory into Netty specific conf as Grizzly doesn't use it
Introduce acceptAnyCertificate config, defaulting to false, close #526, close #352
Merge pull request #572 from AsyncHttpClient/ssl-refactoring

Enable SSL validation
Upgrade Netty 4.0.20 and Javassist 3.18.2
Add host and port to SSLEngine, close #527, close #513
unused import
woups
Minor fix in the contributing section of README
Merge pull request #575 from kryger/patch-3

Minor fix in the contributing section of README
[master] + fix issue #1691
https://java.net/jira/browse/GRIZZLY-1691
"Support RFC 7238, HTTP Status Code "308 Permanent Redirect""
Bump 1.8.11