Merge pull request ethereum#429 from chriseth/keywords

Breaking changes for version 0.3.0

Merge pull request ethereum#398 from chriseth/version

Update version to 0.2.2

Merge pull request ethereum#378 from chriseth/version

Increment version to 0.2.1

Merge pull request ethereum#265 from chriseth/version

Increment version to 0.2.0 (includes breaking changes).

Merge pull request ethereum#221 from chriseth/version

Increment version to 0.1.7

Merge pull request ethereum#146 from chriseth/version

Increment version to 0.1.6

Merge pull request ethereum#124 from chriseth/version

Set version to 0.1.5.

Version 0.1.4

Merge pull request ethereum#88 from chriseth/versionBump

Version 0.1.3.

More information for help screen, some fixes for argument parsing.