Merge pull request ethereum#646 from chriseth/version

Version 0.3.5

Merge pull request ethereum#620 from bobsummerwill/version

Updated version number to 0.3.4.

Merge pull request ethereum#604 from chriseth/version

Set version to 0.3.3.

Version change.

Merge pull request ethereum#469 from chriseth/version

Set version to 0.3.1.

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