s4noc: avoid the bubble FIFO

Add L2 cache to Patmos (#169)

fix typo in sdram de2-115 wrapper

fix MemBridge.scala chisel error

APP cont-test: testing now runs for both a single core and 4 cores.

Added 'cont-tes' app for testing contention cache.

consistent naming with the corresponding paper (#168)

update install list in the handbook (#167)

emulator: removed use of --build for backwards compatibility

emulator: fix type of tick count

patemu: split exit and exitcode

patemu: fixed printed pc

config: added Argo back to altde2-115 so nocinit.c is generated by default

patemu: using bootloader and chisel boring to enable newer verilator

Update README.md (#166)