Initial update of Draw step to svg-edit version 2.6
Fixes and modifications to svg-edit 2.6 source files for WISE compatibility
Update draw step to use vle's jQuery and jQuery UI files
Updated wise4 and simple_color svg-edit extensions to work with svg-edit v2.6
Updated the 'clone' icon in svg-edit 2.6 to custom WISE icon (original clone icon is now used for stamps)
Allow svg markers to have non-local url refs (fixes Firefox rendering problem)
Fixed Chrome bug where svgEditor object is kept in window when visiting subsequent draw steps
Fixed svg-edit bug where draw objects and mouse locations were misplaced in Firefox v20+

- Possibly addresses svg-edit issues 1067, 1077, 1080, 1081, 1084, 1091 (https://code.google.com/p/svg-edit/issues/list)
- Minor title text fix in svg-edit
Merge branch 'master' of https://github.com/WISE-Community/WISE-VLE into svgedit-2.6
Updated svg-edit stamps extension; added default stamp images

- Updated Jquery Really Simple Color Picker (for svg-edit simple color extension) to version to newest version
Fixed a couple display issues with updated svg-edit plugin for draw step
Updated simple color extension for svg-edit 2.6

- Changed color picker to use the Spectrum jQuery plugin (instead of Really Simple Color Picker)
Removed unused code in svg-edit simple color extension
Updated prompt extension for svg-edit

- Fixed an error in the clear all button from the wise4 extension in svg-edit when there are no items on the canvas
Updated prompt extension for svg-edit

- Fixed an error in the clear all button from the wise4 extension in svg-edit when there are no items on the canvas
Merge branch 'svgedit-2.6' of https://github.com/WISE-Community/WISE-VLE into svgedit-2.6
Extracted the erase drawing button in the wise4 svg-edit extension to its own 'clearlayer' extension
Updated some asset paths and css for svg-edit extensions
Updated the svg-edit description extension for svg-edit 2.6 and some style changes
Reworked svg-edit extensions with a convention for publicly accessible methods and variables