use the data as ticks if only there are fewer data points than auto-generated ticks
only show labels for columns assigned to y axis
use bar width of 3px if the computed width is less than 10px
line chart: fix baseline zero for negative values
allow filling below lines
queue multiple alert messages
made alert modal a little nicer
passing dw.backend reference to visualizations
added alternative notification system for vis warnings
showing more helpful notifications
js build
refactored vis.warn to vis.notify
js.build
prevent same message from being alerted multiple times
Removed reserved 'class' word into visusalization-data-table plugin
Replaced native array method 'filter' by underscore implementation in dw.dataset.js\nNative array method is unsupported by IE < 9
Rebuilded the dw-2.0.js file
Regenerated Datawrapper JS files (dw-2.0 & dw-2.0.min)
Merge branch 'feature/FIX-TableChartIE' into develop
line chart: notification about labeling of too many lines