Natspec + test

(got rid of some messy code in test)

Improved CLI

Godeps: bump github.com/ethereum/ethash

This fixes the build.

It is now possible to exit the REPL using Ctrl-C, Ctrl-D or by typing "exit".

The ethereum command line interface is now structured using subcommands.
These separate the different tasks it can perform.

Almost all flag names are backwards compatible.

The key tasks have not been ported to subcommands since they will be
replaced by the new accounts infrastructure very soon.

It is no longer imported by any package in our tree.

Various functions throughout the codebase used it to grab settings. This
has to stop because I want to use them without reading the config file.

These functions can now be used without reading the config first:

* ethdb.NewLDBDatabase
* ethrepl.NewJSRepl
* vm.New

Structured logging updates

* All errors during state transition result in an invalid tx

15ce2ab Merge remote-tracking branch 'origin/PoC9' into PoC9
5970b09 add quadratic complexity and performance test
163fa03 more info
560b844 more info
a885549 more change
5fed708 one more tiny change
213a2b8 changed test format
c20e88b Merge branch 'PoC9' of github.com:ethereum/tests into PoC9
715ed17 Added first ethash test
e26a39f update blockchain tests to latest protocol changes
34baee5 poc9 vm tests
20550d9 update block chain test due to difficulty change
597b2b3 increase gasLimit on stateTests
8f573d3 update blockchain tests - 2048 bit logs bloom
06c90e6 typo
ef935fc extra data is hex now, for real
81ab5ad extra data is hex now
b0aeba8 update blockchain tests
f862faf add tx tests
618d724 update state tests
4a989f0 update blockchainII tests
ed56e82 add more vm tests
0417655 Merge remote-tracking branch 'origin/PoC9' into PoC9
1f1cf5d update block tests
76b5a8b Fix trie formats.
325dd6d Merge branch 'PoC9' of git://github.com/ethereum/tests into PoC9
a261c5b test3
1d3ab36 again

git-subtree-dir: tests/files
git-subtree-split: 15ce2ab8e22275e7aa93742cb5f8bc63e4e50db5