doc: use "Groonga" notaion to ja limitations.po
Merge pull request #126 from cosmo0920/use-Groonga-limitation-po-ja

doc: use "Groonga" notaion to ja limitations.po

Patch by cosmo. Thanks!!!
doc ja: update po

    % cd doc/locale/ja/LC_MESSAGES && make update
doc: use "GQTP" notation
doc: use "Groonga" notation related to introduction.txt and po
Merge pull request #127 from cosmo0920/use-Groonga-introduction

doc: use "Groonga" notation related to introduction.txt and po

Patch by cosmo. Thanks!!!
doc: don't use "Groonga" notation for "groonga" executable file

We should use the same notation as command line. In command line,
"groonga DB_PATH ..." is used.