update file manager lib
Merge branch 'master' of https://github.com/modilabs/enketo into revamp_file_uploads
refactored prepareFormDataArray as part of #523
minor edits
show error message if file cannot be retrieved from browser filesystem during submission, allow submission to go ahead, closes #522
fix webform/single (corrected single-submission button), closes #567
moved XSLT sheets to their own repo, and added this as a submodule,
moved enketo-core to its own repo and added this as a submodule
removed old JSDocs
removed all dristhi bits (now in their own repo martijnr/enketo-dristhi or modilabs/enketo-dristhi)
upgraded enketo-core, fixed JS builds with grunt, #471
removed bunch of dev libraries because they can now nicely be installed with npm and package.json
tests now running with grunt and should be running travis, not passing in html test runner yet
fixed test runner in browser for localStorage
consistent JS style, use JSHint instead of JSLint and make it fairly happy
switched to grunt sass build system extending martijnr/enketo-core
minor styling, logging removal, jshint satisfyer
updated .htaccess rewriteCond according to new build system
Merge pull request #574 from modilabs/grunt

Massive reorganization and cleanup, using grunt for builds now