Second release

Hardware :

- switch from the Pololu step-up/step-down voltage regulator to a LDO
voltage regulator
- switch from Arduino Mini Pro to a standalone ATMEGA328 microcontroller
- switch from the Telit GL865-QUAD GSM/GPRS modem to the GPRSbee /
SIM900 module
- addition of a solar panel and a Li-Ion/Li-Po solar charger IC
- addition of a 24LC1025 EEPROM

Software :

- creation of an interface library to the GPRSbee module
- creation of an interface library to the 24LC1025 EEPROM
- renaming of the GPS interface library from "MTK3339" to "Ultimate_GPS"
- implementation of new store & file upload (POST requests) functions