adjusted build/osx/runtime/Makefile a bit.
updated swf2lwf.rb and related toolchain.

* introduced bitmap fill (experimental).
* introduced gif support (experimental).
* imported rb-img.
merged latest lwf.js.

* fixed WebkitCSSDomElementRenderer.
* introduced gif support (experimental).
* modified not to call enterFrame twice by frame jump.
* exported isBitmapClip, isButton, and isMovie.
* fixed missing buttons.
* exported setTextureParameter.
* introduced bitmap fill (experimental).
* fixed scaleForWidth, scaleForHeight.
added USE_PAGE_SHOW_HIDE_EVENTS configuration and gif support.
fixed global variables.
updated test-html5.js.

* applied a patch for buggy touch event support.
* polished touch event handling a bit.
* disabled isBuggyWebGL part.
* elaborated the warning when swf is placed directly under LWFS_work/.
* added use_page_show_hide_events configuration.
added note on mavericks to build/osx/README*.txt.