improved HTTP Sender
added charset to header Content-Type
added decompressing helper method
added HTTP response reading (for debug only)
use simpler (and faster) hashing algorithm
set default profile to "production"
simplified HTTP Sender
added integration test
Merge remote-tracking branch 'origin/develop' into develop

Conflicts:
	modules/core/src/main/java/com/crashnote/core/send/Sender.java