Update AsyncHttpClient.java
Merge pull request #609 from grumoon/master

Update AsyncHttpClient.java
Documentation change
Group up strings into classes and reuse them.
Merge pull request #615 from fineswap/NormalizeStrings

Group up strings into classes and reuse them.
Out-of-the-box working example for custom CA.

I have contributed a sample link on my personal server. It's dedicated solely for use by the library, and hopefully will not be abused.
Merge pull request #616 from fineswap/CustomCAFix

Out-of-the-box working example for custom CA.
Retry request sample.
Updated Manifest file.
Merge pull request #617 from fineswap/RetryRequestSample

Retry request sample
Add sample showing use of Range response handler.
Add Javadoc for class.
Merge pull request #620 from fineswap/RetryRequestSample

Add Javadoc for class.
Merge pull request #619 from fineswap/RangeResponseSample

Add sample showing use of Range response handler.
Update AsyncHttpResponseHandler.java
Merge pull request #623 from grumoon/master

Update AsyncHttpResponseHandler.java
Merge commit 'f3a08c9a214dc4d8f41d1ca0000a748344a70e88'