Merge pull request #30 from gumbypp/master

JBChartView: needs initWithCoder initializer for inflation from a xib
Fixed issue #30
updated read me, etc for new version
Fixed issue #33
Updated for new version
Fixes issue #36
Added delegate method to configure the width of the vertical selection bar in a line chart.
Merge pull request #37 from veducm/master

Added delegate method to configure the width of the vertical selection bar in a line chart.
Fixed comment
Clamp selection width to width of chart
Updated read me, pod spec etc for new version
Fixes issue #34
Added screenshot to pod spec
smooth curve using bezierpath
Expose smooth option through delegate, fix diffs
added check for y-value difference if exceeds threshold
changed compare condition to using slope instead of vertical diff
PR #39 cleanup
More style updates
updated change log, pod spec, read me