fix some memory leaks.
sync for thread safety
more memory leaks
increment reference count as per clang
memory leak fix
more memory leak fixes.
Merge pull request #57 from tsaizhenling/master

memory leaks
Switch from SVGKSourceReader to NSInputStream
Merge pull request #66 from aleph7/streams

Switch from SVGKSourceReader to NSInputStream
Eliminate an SVG parsing hotspot
Add NSCharacterSet extension to SVGKit project
Merge pull request #67 from djz-code/whitespace_hotspot

Fix an SVG parsing hotspot
Refactored and added: SVGKSource split into sensible subclasses, and added a subclass to handle loading an SVG directly from a raw, in-memory NSString
Fixed: major bug with [NSCharacterSet SVGWhitespaceCharacterSet]
FIXED: SVGLayeredImageView now defaults to an obvious ugly purple background with error message embedded in the image itself :).
IMPROVED: the demo project now has a cleaner structure for loading the different 'kinds' of sample
Improved the error message when trying to init an SVGKImageView from an Xcode Interface builder NIB / StoryBoard
Added automatic filename versioning to the library build
Merge branch '1.1.0' into fixing-viewboxes-and-viewports
FIXED: SVGKit now scales images in a standards-compliant way.
NB: it ALSO has some backup techniques - c.f. SVGKImage setScale: - for the cases where the SVG-Spec standard approach WONT work