3.26 Feature 402 Internationalization

- added locale setup.
- modified siv.ini template.
- added gettext i18n shell scripts.
- removed locale.setup.sh (replaced by i18n.setup.sh)
- fixed incorrect script name.
- removed i18n.merge.sh (moved to grunt).
- added grunt-shell install to grunt setup.
Merge pull request #57 from twineapp/3.26-feature-402-i18n

3.26 feature 402 i18n