added ServiceContainer for APIs
added unirest dependency
Revert "added unirest dependency"

This reverts commit 18ee25e1ec812ad7d8fa76e93331c7e88faf9a0e.
re-added unirest dep
enable autodiscovery by default
removed hardcoded mashape keys
updated documentation

added section and page for service-container docs
use environment variable MASHAPE_KEY
added file-header
added test for manual service-registration
more descriptive testname
changed test-order, perform autodiscovery=off test first