[BioRuby] Removal of Bio::KEGG::API because the service discontinued

[Naohisa GOTO]

Hi all,

I'll remove Bio::KEGG::API in lib/bio/io/keggapi.rb and related contents.
As already announced in the KEGG website (http://www.genome.jp/kegg/soap/),
the SOAP API is discontinued in 2013/1/1 and the Bio::KEGG::API class no
longer works.

New version of KEGG API, which is based on REST, is already started.
Users of old KEGG API should migrate to the new REST-based KEGG API.
See http://www.kegg.jp/kegg/rest/ for more information.

Naohisa Goto
ngoto at gen-info.osaka-u.ac.jp / ng at bioruby.org