Debug timer 0 and timer 1 on atmega2560
Added timers test, to check timer 0 and 1 on atmega (tested on atmega2560)
Merge pull request #33 from astralien3000/timer-fix

Timer 0 and 1 fix on atmega2560.
Corrected a wrong word in README
Added cxa test
Added __cxa functions to aversive.cpp (avr)
Merge pull request #38 from astralien3000/cxa

AVR __cxa functions
Begining of scheduler debug.
WARNING : Scheduler is broken.
SASIAE compiles but don't work.
AVR don't compile.
Moved scheduler algo in the common branch.
New version of scheduler available on avr.
Debug of timer 0 prescaler configuration.
Debug compilation script
Deleted sources files (not used anymore)
Added Schduler lock and unlock functions.
Added mask config to every timer prescaler.
Modified scheduler test for avr
Management of the scheduler counter overflow.
Has been tested, but need more tests.
Scheduler test with MAX_TASKS.
Scheduler now take in account task's priority.
Changed Timer Prescaler 0 to 1.
Updated (AVR's) Scheduler test.