Common era
Included Date::Leapyear in dist.ini
Support enquring about multiple leap years
Added some synonyms for previous, next and current and made it more strict
Tenses
Split up into functions and 'most recent leap year' is now inclusive
Stricter regex; improved secondary example
Improved perl techniques and removed a bit of left behind debugging code
Fixed there being too many years; added after and before
After/before can now use the pretty year
Updated test
Fixed test
After/before can now use the pretty year
Removed debugging info; Corrected tests
Annotated some subroutines
Swithed to using '==' instead of 'eq'
Removed unnecessary options and the like
Created DDG::Goodie::VimCheatSheet +tests
FrequencySpectrum: Formatting.
FrequencySpectrum.pm: Change the "More at ..." link based on the results.

Also format the code.