Expand miRBase description
Show a link to metasearch help if no results are found in metasearch
Add `length` to search fields in Help
Display a status message while running metadata search
Do not show Species sunburst tab on RFAM and ENA pages
Use only 2 colours on species sunburst
Add small class to the alert div
Wrap `code` elements. Without this documentation pages look bad on mobile devices
Reset error message, if any, before submitting a new search. Fixes #3. Thanks @blakesweeney!