Merge pull request #49 from ujihisa/master

%a for go/go
outputter/buffer: Add `outputter_buffer_opened` hook point
outputter/buffer: Add the description about `outputter_buffer_opened`
Ignore an error on hook.priority()
write each module as absolute names
v:version check does not work in 7.x.1-202
Merge pull request #51 from tyru/fix/doc/quickrun-module

write each module as absolute names
Merge pull request #52 from tyru/version-check

v:version check does not work in 7.x.1-202
help: Remove old specification