Issue-740: Limit the queue size in the default ThreadPool in the SimpleHttpClient

Initial commit
Issue-740: Limit the queue size in the default ThreadPool in the SimpleHttpClient

Update pull by adding a SimpleHttpClientBuilder
Issue-740: Limit the queue size in the default ThreadPool in the SimpleHttpClient

Add a SimpleHttpClientConfiguration in addition to the SimpleHttpClientBuilder
Issue-740: Limit the queue size in the default ThreadPool in the SimpleHttpClient

merge with master
Issue-740: Limit the queue size in the default ThreadPool in the SimpleHttpClient

use a factory
Issue-740: Limit the queue size in the default ThreadPool in the SimpleHttpClient

merge with master (again)
Issue-740: Limit the queue size in the default ThreadPool in the SimpleHttpClient

merge the branch
Issue-740: Limit the queue size in the default ThreadPool in the SimpleHttpClient

merge with master again
Merge pull request #772 from leleuj/cas-740

Issue-740: Limit the queue size in the default ThreadPool in the SimpleHttpClient