Update openlexington.org

[mikedillion]

All information can be found in the 2015 OpenLexington
Strategic Plan.

• add code of conduct to website
• add list of core team members
• add municipal partners
• add community partners

[chaserx]

I also want to update the website style... but that's another issue.

[bFraley]

I've submitted a pull request that resolves the remaining tasks for this issue.