- First step for integration of the analytics framework in the collectagent
- QueryEngine and REST API integration still missing
- Proper testing still to be done
- Added a probe function: the global config file is scanned before
initialization, and if no data analytics plugins are requested, no
sensor navigator is built

- Boolean configuration options now all accept "true" and "on" keywords
- Cache interval and thread count parameters removed from the command-line
interface for consistency; these can still be set in the config files
like all other parameters
- global.conf file renamed to dcdbpusher.conf for consistency

- Sensor caches across DCDB are now managed by the CacheEntry
implementation under "common"
- Provides utility methods to perform averages, checks, get views etc.
- SensorCache class in collectagent kept due to its libdcdb dependencies

- Added a 'common' directory where all shared code has been placed
- Analytics package has been moved out of dcdbpusher, now has its own makefile
- Some renaming here and there for uniformity

- Fixed a minor issue that caused text corruption when using the -h
option on certain shells
- Collectagent now exits gracefully also when receiving a SIGTERM signal

- Added configuration options to tune the Cassandra driver for
optimal performance
- Added a "debugLog" configuration switch that enables logging of
errors in asynchronous inserts in the Cassandra driver

- The CollectAgent sensor cache is automatically purged each X seconds
(X is configurable through the cleaningInterval parameter), deleting
all entries than have not been updated in the last X seconds
- Fixed some minor bugs related to index management in sensor caches

- Round-robin thread-to-connection assignment policy (speedup on
small instantiations)
- Sensor cache entries are pre-allocated to avoid reallocations, and
shrunk to the correct size later
- Avoiding heap allocations during message processing and recycling buffers

- Added BOOST logging in the style of dcdbpusher
- All logging-related functionality is in logging.h

- The collectagent is now configurable, like dcdbpusher
- Available config options can be seen in the sample collectagent.conf file
- Supplying a path containing config files is mandatory, like dcdbpusher;
this may change in the future
- Please do a make all && make install from the root of the repo to update
scripts and directories that were modified to add config support

- MQTT publish messages that have a topic preceded by the /DCDB_MAP/
keyword will be interpreted as sensor name auto-publish messages
- The payload of such messages is a string defining a sensor name, that
is used together with the MQTT topic to perform a "sensor publish"
action on the Cassandra db, like dcdbconfig does

Beautify usage output, streamline parameters with other DCDB tools, and use more meaningful parameter characters

* Added SensorConfig and DCDBPublicSensor classes as interface for dcdbconfig
* Fixed bugs and tested:
  --> CollectAgent fully working
  --> dcdbconfig fully working

* Bump cpp-driver to 2.0.1
* Create new SensorId header/source that takes over the logic
  previously found in SensorDataStore related to populating
  SensorId structs from MQTT topic strings and serializing
  them into Byte Arrays to be used as Cassandra Row Keys.

* Bumped Cassandra to 2.1.5
* Bumped cpp-driver to 2.0
* Eliminated cassandraBackend in favor of DCDBConnection

In the future, a DCDBConnection handles the low-level connection
to Cassandra. On top of an established DCDBConnection, you can
create a SensorDataStore object which gives you access to raw
sensor readings.