add 'locales' make target for cloning/pulling/updating locale repositories
ignore locale repositories cloned by build/make-locales.py
add license headers to build scripts
flush between print and subprocess calls so output is in sequence
convert LOCALES_FILE and LOCALE_BASEDIR paths to Windows-style on Windows
use version of Gaia with multilocale build fixes for Windows
Merge pull request #413 from mykmelez/make-locales

support building multilocale Gaia