Fixed max-idx for slider

When creating slider max-idx should be count-1 not count
bump version to 1.5.2-SNAPSHOT
Merge pull request #161 from hesperus22/master

Fixed max-idx for slider
add initializer to $data

this fixes #159
fix view method for matrix
Issue 166 Support for logarithmic axis

Added "set-axis" and "log-axis" with support for the
most common charts.
Merge pull request #167 from jakubholynet/master

Support for logarithmic axes