fix runtime auto-pluralization, fixes #3
don't return success on failure, closes #4
fix up error formatting, closes #5
make export command availble to grunt et al, fixes #8
support literal string concatenation in defaults, fixes #6

this way you can break up a string for readability without the extractor
choking on it, e.g.

    I18n.t("lorem ipsum dolor sit amet bacon narwhals zomg this " +
           "is getting out of control")
preserve whitespace, fixes #9

i18nliner-handlebars should be doing this in its pre-processor