re-implemented ethernetif and power-on flow of lwip1.4, note:  ethnet driver and init invokings also need to be modified.

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1. Solve the problem mentioned in revision 1623 (runtime error) 
   - Cause: In the EFM32 demo application, some TCP/IP functions are called in non-task context (e.g. "tcp_new()"). And after revision 1621, those functions will trigger the scheduler ("rt_schedule()") which seems to be triggered only in task context. 

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1. Remove "RT_USING_NETUTILS" defined in "rtconfig.h" to avoid compiling error
   - Warning: Due to the memory limitation, running lwIP on Gecko devices (EFM32G) is not properly tested.
   - Warning: To test lwIP, please revert the file, "components\net\lwip\src\arch\sys_arch.c", to revision 1620. There is a runtime error when working with the latest revision of that file. This error is currently under evaluation.

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1. Add ENC28J60 Ethernet controller driver 
2. Add lwIP support (Please read "Readme.txt")
3. Add simple Http server demo application
4. Modify USART device write function to avoid sleep in ISR
5. Fix a bug in USART driver when using compiler optimization
6. Modify to make use the start-up code in libraries
7. Change the default build option for squeezing the executable file size
8. Modify source code alignment

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Rename and updated libcpu/avr32/uc3/exception.x (with .irp macro) to exception_gcc.S (without .irp macro) for better compatibility.

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