rename dir name

Signed-off-by: noboru kudoh <noboru.kudoh@gmail.com>
rename
 ignore target/report directory

Signed-off-by: noboru kudoh <noboru.kudoh@gmail.com>
 change rspec dir name

Signed-off-by: noboru kudoh <noboru.kudoh@gmail.com>
 Update GemFile

Signed-off-by: noboru kudoh <noboru.kudoh@gmail.com>
 add buildfile for Buildr experimental

Signed-off-by: noboru kudoh <noboru.kudoh@gmail.com>