Merge pull request #6 from euroelessar/master

Moved rapidjson headers to grape subdir
v0.6.8
libcocaine-plugin-queue-driver should also depend on grape
Moved lexical_cast() to common header
Use 'configure' event to configure the queue. Its data is queue internal name.
Get rid of obscure m_queue_id, use random ID to talk to queue. Debug prints cleanup.
Added libelliptics_client into list of elliptics libraries
Added queue starter application - it starts named workers and configures them one after another.
Install queue-starter into bin directory
Depend on 2.24.7+ elliptics
v0.6.9
Renamed queue starter to grape-queue-starter
Put queue-starter into lib/grape dir, since it is not a general purpose binary.
Use direct flag when setting up queue - elliptics should not route there messages
v0.6.10
We do not install queue starter into bin anymore
Set queue ID to what was provided at start (named queue name) + what was received in configuration event.
Let queue starter set log level
v0.6.11
Do not use DIRECT flag when configuring queues, since replies are sent to those IDs specified in original message. DIRECT flag breaks route table and replies may never reach node client is connected to