don't install pygments.rb on JRuby
add note
switch sample png avatars to jpg
ignore jar built by warbler
fix BOM regexp in JRuby
don't attempt to chdir to DATA_DIR; use full path

- fixes failure when gem is located inside a JAR
- also resolve docdir to '.' when empty to avoid file resolution problem
set version to 1.0.0.alpha.3
Release 1.0.0.alpha.3