fixed imageCreateFromLazyByteString, peek from CString with specified length,
to avoid recognizing zeroes in data as NULL-termination in string
Added missing API to wxc:
wxGrid: cell spans, cell renderers (numeric, auto string wrapping)
wxScrolledWindow: show/hide scrollbars
wxSplitterWindow: control sash gravity
Merge pull request #12 from nickela/master

Fixed image creation from bytestring bug