Switch to Markdown for README. Minor cleanup.
Tweaks
More tweaks
Fix run command line
Extra spacing
Consistent shell indication
Contributing, contact and license sections
Errant backtick. Header consistency.
merge nathanlws: README tweaks and cleanup

Merge pull request #67 from nathanlws/sql-parser/readme-to-markdown
https://github.com/FoundationDB/sql-parser/pull/67