better way to add empty spans to tables without slowing down the form
fixes bug that omitted new icon-font from manifest
fix for form header print button,
slightly improve issues with print script in FF, for #67
upgraded enketo-core with print fixes
Merge pull request #687 from MartijnR/master

print improvements in enketo-core
Merge pull request #688 from SEL-Columbia/master

print improvements, mostly in enketo-core