Rename metrics/[metric]/init.rb to metrics/[metric]/metric.rb

Improve naming of metric config file from 'init' to 'metric', as they
all subclass 'metric'.

find . -name 'init.rb' | ruby -e 'STDIN.readlines.each {|line| line = line.strip; `git mv #{line} #{line.split("/")[0..-2].join("/")}/metric.rb` }'
Rename metrics/[metric]/[metric]_grapher to metrics/[metric]/grapher

find . -name '*_grapher.rb' | ruby -e 'STDIN.readlines.each {|line| line = line.strip; `git mv #{line} #{line.split("/")[0..-2].join("/")}/grapher.rb` }'
find . -name '*_grapher_spec.rb' | ruby -e 'STDIN.readlines.each {|line| line = line.strip; `git mv #{line} #{line.split("/")[0..-2].join("/")}/grapher_spec.rb` }'
Rename metrics/[metric]/[metric] to metrics/[metric]/generator

cd lib/metric_fu/metrics
find . -name '*.rb' | ruby -e 'STDIN.readlines.each {|line| line = line.strip; home, metric, filename = line.split("/");  `git mv #{line} ./#{metric}/generator.rb` if "#{metric}.rb" == filename}'
cd -
cd spec/metric_fu/metrics
 find . -name '*_spec.rb' | ruby -e 'STDIN.readlines.each {|line| line = line.strip; home, metric, filename = line.split("/");  `git mv #{line} ./#{metric}/generator_spec.rb` if "#{metric}_spec.rb" == filename}'
cd -
Rename metrics/[metric]/[metric]_hotspot metrics/[metric]/hotspot

find . -name '*_hotspot.rb' | ruby -e 'STDIN.readlines.each {|line| line = line.strip; `git mv #{line} #{line.split("/")[0..-2].join("/")}/hotspot.rb` }'
find . -name '*_hotspot_spec.rb' | ruby -e 'STDIN.readlines.each {|line| line = line.strip; `git mv #{line} #{line.split("/")[0..-2].join("/")}/hotspot_spec.rb` }'