Make this compatible with Redmine 2.x.
Updated README with install instructions.

Also mentioned that this is a fork to support Redmine 2.x
Add hyperlinking to mentions
Initial commit for autocompletion on the issue form
Only matching strings that start with @ to avoid emails
Fixed regex to test for strings starting with @ to avoid email entries.
Changed user syntax to @username.
Was only matching one entry.
Was only matching one entry.
Was only matching one entry.
Match usernames with a separator, such as @user.name
Merge branch 'autocomplete'