Merge pull request #131 from forio/documentation

docs (but no fiddle yet) for config.line.animationDireciton, #114
Merge pull request #132 from forio/documentation

feedback from code review
Updated link in contribute.md
Fixed stacked area chart when options.yAxis.min is undefined
Release 0.0.77
removed old files
Added basic line example and moved previous basic to custom markers
Adjusted descriptions
Changed animation easing to linear for line left-to-right animations
Added comments to gallery example
Added dotted line to a showcase example
Moved bar-basic to bar-styled and made bar-basic really basic
Added bar chart with background image
Rename line-custom-markers to line-markers
Renamed chart
Added 2 line title to bar sacked
Moved column-basic to column-styled
Added column basic
Change size of pie-gauge
Styling on pie-gauge and removed old files