Olympic release (0.9.20)

Merge pull request ethereum#888 from obscuren/develop

miner, flags: Configurable gas price & log flag change

version 0.9.17

updated ignore

0.8.6

* Fixed consensus issue

0.8.5

* Added `eth_logs`
* Fixed log issue
* Added number to logs

Merge branch 'hotfix/0.8.4-1' into develop

PoC 8

Hotfix 0.17.11

* block manager would stick with a disconnected peer during download

Fixed EVM environment. Closes ethereum#215