Tested and fixed parse method for receive messages.
Changed to public the getReceiveMessageType() function.
Added control to valid message flag of RMC message.
Added function to convert longitude and latitude value from NMEA version to degree.
Implemented function to convert string into time informations. Ended the parse of RMC message.
Added function to convert multiple strings into date informations.
Added command to setup nmea output message.
Small fix to parse function and coordinate convertion function.