Merge pull request ethereum#1622 from ethereum/develop

Solidity version 0.4.9

Merge pull request ethereum#1561 from ethereum/develop

Merge develop into release for 0.4.8

Merge remote-tracking branch 'origin/develop' into release

Merge pull request ethereum#1514 from ethereum/changelog

Update changelog for release.

Merge pull request ethereum#1514 from ethereum/changelog

Update changelog for release.

Merge pull request ethereum#1418 from ethereum/develop

Release 0.4.6

Merge remote-tracking branch 'origin/develop' into release

Merge pull request ethereum#1405 from ethereum/version

Update version.

Merge pull request ethereum#1405 from ethereum/version

Update version.

Merge pull request ethereum#1308 from ethereum/develop

Merge for version 0.4.4