Refactored core and line and bar charts to include foreignObject labels with fixed offset
Added shortcut to options.height if it's a pixel value
Added number conversion of option.high and options.low and optimized scale loop, fixes parts of #72
Refactored foreign object to accept attributes object instead of fixed params
Added styles for foreignObject labels
Fixed chart rect calculations for very small charts
Fixed outdated config values
Added feature detection for foreignObject and fallback for browser which do not support it
Fixed base chart api documentation
Added new example for multiline text
Added number conversion for possible string data values, fixes #72