This prevents commands like `nvgQuadTo` and `nvgArcTo` from double-transforming the previous point when they pass it back to `nvg__appendCommands`.

- added function to allow to combine scissor rects using intersection

- added projects section to read me
- added processing API link (issue #135)

- added typedefs for all structs
- fixed some compiler warnings

only specify precision for fragment shader

- set stb_image flags so that it loads correct data in iPhone

update upstream stb things.

Auto detect and resize text altas texture.

allows for nanovg_gl prototypes to be declared simultaneously

Tweaked premake to remove some windows warnings.

second attempt at avoiding warnings at /W4 on vs2013

use -1 as the 'no scissor' value, rather than 0, so that 0 width still scissors

Memory leak + small fixes

fix nvgCreateImageFromHandle for GLES2/3.

- fixed stroke cap tessellation amount calculation

- added nvgQuadTo, draws quadratic bezier curve segment

- all colors in the shader is handled as premultiplied
- removed alphaBlend param from nvgBeginFrame(), it became obsolete
- added NVGL_TEXTURE_PREMULTIPLIED flag
- separated FBO example
- FBOs are treated as premultipied for correct alpha
- changed FBO storage from depth/stencil 24/8 to stencil 8
- moved discard to end of shader which restores the render speed again

- added (optional) 3-pass stencil trick to stroke rendering, reduces
overdraw artifacts, a little slower
- fixed some text bounds issues

- Added alpha for images
- Added global alpha

- fixed glyph position bounds for whitespace

- fixed flags setup in nvglCreateImageFromHandle
- changed frame buffer to only compile on GL3
- changed nvgluCreateFramebuffer() to return FBO struct instead of
filling existing one (for consistency)

add external APIs to GL backend to get native Texture Id.

Relax stroke width limit