More helpful error message when ZipInstaller fails
Merge pull request #173 from twheel/upstream

More helpful error message when ZipInstaller fails
Designer app remembers the tab you were on last
Merge branch 'master' of github.com:jbroadway/elefant
Designer should recognize CSS files in subfolders of theme folders
Added session_domain setting so sessions can work across subdomains
Added session_duration setting to control session expiry length
Updated instructions in config
Fixed fatal error in translator add handler, closes #174
Select multiple files at once from filebrowser
Tweaks to css and to multi-xxx title and new_file defaults
Minor i18n and style changes to multiple select in filebrowser
Renamed configuration from FileManager's root path to Paths/filemanager_path
Renamed configuration for Navigation app from Navigation/json_file to Paths/navigation_json
Added configurable paths for multi-file and multi-image.
Also fixed bug in js where last_path wasn't being set properly if
the dirname didn't have a trailing '/'.
Created a function to escape strings for RegExp & used it to escape 'filemanager_path' variable.
Fixed for IE9 filedrop as per https://github.com/weixiyen/jquery-filedrop/pull/117/files#r3785981
Removed checking of Paths/filemanager_path and Paths/navigation_json config options within index.php.
Fixed typo in RegExp line of multi-file.js
Made $webroot dynamically updatable by conf('Paths','filemanager_path')
Created default Paths for navigation_json and filemanager_path
Global config loading should cascade from conf/ELEFANT_ENV.php to conf/config.php for defaults