Feature #45 Measure conversion

- BPUtils: use one dateFormatter, use one numberFormatter
- BPDateIndicatorsView: use BPUtils for diplaying temperature
- BPSettingsProfileViewController: use BPUtils for diplaying measures
- BPTemperaturePicker, BPUnitPicker: use decimal separator
- BPMyTemperatureSelectViewController: use BPUtils
- don't use default value for temperature