New dmd version

Fix deprecation warnings in the new dmd releases.

Bug fix release

Merge pull request #36 from MikeWey/gtkdfix

Mark some variables as gshared to avoid segfaults with GtkD.

Experimental support for log10 scale

Also improved seed reporting in random unittest.

Multiline titles

This release adds support for multiline titles, as implemented by @drug007 (PR #30)

API, guides and colour

• Improvements to the API, which supports more idomatic D code (thanks @wilzbach for the suggestions)
• Add support for guides, which unifies the handling of types (double, int, string etc)
• Switch to external version of the color library.

Improve dealing with corner cases

Fixed geomHist(2D) and statDensity(2D) to correctly deal with cases were the max and min passed values are the same.

Legends

This release adds support for both continuous and discrete legends. You can add these legends to your plot using:

gg.put(continuousLegend);
gg.put(discreteLegend);

Additionally a number of small bug fixes and refactorings were performed.

Improved compatibility with gtkd cairo implementation

Contributed by @ljubobratovicrelja

Refactoring to lower memory usage during compiling and binary size

Horcruxify code and reduce usage of string mixins

Another fix to the unittest

In rare cases one of the randomized tests would fail.