Merge pull request #5 from jchodera/master

[WIP] Updated README.md with markdown version of changelog.
Add molecule nickname column
Added header field
Add nicknames to pickle.
Merge pull request #7 from leeping/master

Add a nickname column to database.txt and database.pickle. This is a nickname which is short, unique, and specific, and in some cases consists of the common name of the molecule. Spaces are replaced by underscores.
Updated README.md listing the most recent minor revisions, including Lee-Ping's addition of nicknames. Removed mobley_4689084 which duplicates mobley_352111, and updated database.txt and database.pickle accordingly.
Merge pull request #10 from davidlmobley/master

Removing redundant compound mobley_4689084, updating README.md