Merge pull request #3 from ethers/pr

made genkey function client-side
genesis()
trivial initBlock()
trying alloc
basic alloc ok
mock accountToDict()
start mktx()
start rlp encode
fixing encode
handle arrays
start modularizing
ignore tmp file
tx serialize()
start coerce_addr_to_bin
decodeHex
encodeHex
need to dbg undefined mktx
missed the return; now mktx looks good
start tx parse