Added interactions: Drag to select time range in histogram, click on pie slice in terms mode, click on region in map

add big loaded animation to panels that need it. Switched up color scheme, made text panel support plain text, markdown and sanitized html

Added font size selector to table panel (issue #10). Added ability to configure temp url ttl and disable sharing of via short links

Added column panel, refactored panel adding from rows to include panel specific parameters. Moved call to init function to template to avoid double init