Assert user and event attributes

Signed-off-by: Miguel M. Almeida <miguelcma@cma-retina.lan>
Missing event attributes on Event track: method

Signed-off-by: Miguel M. Almeida <miguelcma@cma-retina.lan>
loadNewValues->loadValues + requestNewValues -> requestValues

Signed-off-by: Miguel M. Almeida <miguelcma@cma-retina.lan>
Assert NSDictionary keys for events and users

Signed-off-by: Miguel M. Almeida <miguelcma@cma-retina.lan>
Refactor withFallback to fallback:

Signed-off-by: Miguel M. Almeida <miguelcma@cma-retina.lan>
Code optimization in development mode

Signed-off-by: Miguel M. Almeida <miguelcma@cma-retina.lan>
Logging messages

Signed-off-by: Miguel M. Almeida <miguelcma@cma-retina.lan>
Normalize data types before toJSON:

Signed-off-by: Miguel M. Almeida <miguelcma@cma-retina.lan>
DataPoints and LiquidPackage not including targets

Targets are now included inside Values

Signed-off-by: Miguel M. Almeida <miguelcma@cma-retina.lan>
README.md changes, regarding new signatures without with:

Signed-off-by: Miguel M. Almeida <miguelcma@cma-retina.lan>
Change log for 0.6.1-beta release

Signed-off-by: Miguel M. Almeida <miguelcma@cma-retina.lan>
Logging messages improvements

Signed-off-by: Miguel M. Almeida <miguelcma@cma-retina.lan>
Less error logging messages

Signed-off-by: Miguel M. Almeida <miguelcma@cma-retina.lan>