Add home-button properties to index_template and readme
ignore smylink to smartgraphs project.
downnload_activities.py:  copy activities specified in menu/source.html  to smartgraphs/app/activity_json
Update documentation with information about how to download activity json.
rm hard-coded proj from copy-image script, get name from config.xml
Download activities -- use index.source_html as source. Relative paths.
Script to build the sprout core app.
Mention possibly building SmartGraphs using ./build_sproutcore.sh
remove old images, and fix relative path of cached images.
Handle cases where activity URL, activity name, and internal name vary.
Merge branch 'master' into textarea_bug

Conflicts:
	hooks/after_prepare/copy_images.js