Merge pull request #2 from glatorre/master

Restructured code due to modularization
First import for arduino-specific source code
Fixed bug which affects sensor's configuration
Handled board disconnection and reconnection

Jira issue: WP-1074
Merge pull request #3 from glatorre/WP-1074

Handled board disconnection and reconnection
Handled conversion for values read from sensors

Jira issue: WP-1107
Set sandbox's dependency as optional

Jira issue: WP-1107
Merge pull request #4 from glatorre/WP-1107

Handled conversion for values read from sensors  [WP-1107]
Implemented ZigBee driver for Arduino

Jira issue: WP-1120
Merge pull request #5 from glatorre/WP-1120

Implemented ZigBee driver for Arduino [WP-1120]
Handed services' unregister when board is disconnected

Jira Issue: WP-1125
Fixed wrong conversion of values read from sensors

Jira Issue: WP-1125
Fixed bug which prevents to register several sensor of same type

Jira issue: WP-1125
Merge pull request #6 from glatorre/WP-1125

Handled services' unregister when sensors/actuators have been removed
Pass correct value to actuators