Fix karma exec cmd in build
Fix karma exec cmd in build

The karma executable in node_modules/karma/bin isn't executable in the
repo, so we need to call the right command (node) explicitly.

Also fixed a few whitespace glitches in the build file (a space before
several, but not all, <arg> parameters) to make it internally consistent.

sil-jterm-2015/sfwebchecks,ermshiperete/web-languageforge,sillsdev/web-cat,ermshiperete/web-languageforge,UpstatePedro/web-languageforge,sillsdev/web-scriptureforge,sillsdev/web-scriptureforge,sil-student-projects/web-languageforge,sil-student-projects/web-scriptureforge,sil-student-projects/web-scriptureforge,sil-student-projects/web-scriptureforge,sil-jterm-2015/sfwebchecks,ermshiperete/web-languageforge,sil-student-projects/web-languageforge,sil-jterm-2015/sfwebchecks,sillsdev/web-cat,sil-student-projects/web-scriptureforge,UpstatePedro/web-languageforge,sillsdev/web-scriptureforge,UpstatePedro/web-languageforge,UpstatePedro/web-languageforge,sillsdev/web-scriptureforge,sil-jterm-2015/sfwebchecks,UpstatePedro/web-languageforge,sillsdev/web-cat,sillsdev/web-scriptureforge,sillsdev/web-scriptureforge,sillsdev/web-cat,sillsdev/web-cat,sil-jterm-2015/sfwebchecks,ermshiperete/web-languageforge,sil-student-projects/web-languageforge,sillsdev/web-scriptureforge,sil-student-projects/web-languageforge,sil-student-projects/web-scriptureforge,UpstatePedro/web-languageforge,sil-student-projects/web-languageforge,sil-student-projects/web-languageforge,ermshiperete/web-languageforge,sil-student-projects/web-languageforge,ermshiperete/web-languageforge,sillsdev/web-scriptureforge,sillsdev/web-cat,sillsdev/web-cat,sil-student-projects/web-languageforge,sil-student-projects/web-scriptureforge,sillsdev/web-cat,ermshiperete/web-languageforge,sil-jterm-2015/sfwebchecks,ermshiperete/web-languageforge,sil-student-projects/web-scriptureforge,UpstatePedro/web-languageforge