[CorePlot] Update bindings to version 1.4
[CorePlot] Updated makefile to download version 1.4
[CorePlot] Updated sample to reflect 1.4 Api changes
[CorePlot] Corrected HintPath to the actual CorePlotiOS.dll
[CorePlot] Removed outdated dll and corrected some types
[CorePlot] Bring back author headers (oops!) on binding/enums.cs and binding/extras.cs
[CorePlot] Updated README
[CorePlot] Added some getters and renamed some methods to match the Old Api
Merge branch 'master' into coreplot-1.4
Merge pull request #181 from mono/coreplot-1.4

Update Coreplot binding to version 1.4