Update README.md

add note about dev branch & snapshots
Merge branch 'develop'
Merge branch 'develop'

* develop: (35 commits)
  bugfix quat-from-matrix44 (transposed fields), add roundtrip unit test w/ rand permutations
  add/update matrix & quat tests
  add as-axis-angle
  add g/+ & - impls for Matrix32/44
  update dependencies: common 0.3.0-SNAPSHOT, color 0.1.0-SNAPSHOT, CLJS 2322, update refs to color ns
  replace (nth 0) occurances with (first)
  update/optimize filter-attribs
  bugfix media link
  update media links
  add examples for decorators & instancing, update result filenames
  add :transform attrib matrix converter, add support for instancing, add hsb versions for gradients, add line-label decorator & comp-decorators, update adapter metadata handling & rename keys
  add PTranspose impl for Matrix32
  refactor line & line-strip decorators, add segment decorator option (for line-strip), allow arrow-head to specify own attribs
  add support for line & line-strip decorators, add arrow-head, update type adapters
  update media links of example outputs
  add gradient support, add stroke attr presets, update adapter use case, bugfix ns prefixes in renderer ns, update/add examples
  bugfix/add shader ns prefixes in svg.renderer ns
  update svg.adapter ns, add all-as-svg recursive geom.types to svg converter, add example use case, refactor point-seq-format, add more docs
  start refactor svg module structure, split out shader & renderer ns, update attribute handling, add adapter ns for geom.types
  update to macromath 0.2.3, refactor g/mix impls for Vec2/3
  ...
add PTF ns (geom.types.utils.ptf) and sweep-mesh creator
add PMeshConvert impl for Bezier2 (using ptf/sweep-mesh)
add PTF example and render
refactor sweep-profile, extract sweep-point, add weave example & render
migrate weave-strand & weave-mesh into ptf ns (from demo), update opt arg handling in sweep-mesh, add alt. weave example render
update PTF examples
refactor ptf/weave-mesh (extract weave-strands to produce individual meshes), add new example & render, update existing examples
rename weave-strand(s) & weave-mesh into sweep-strand(s) and sweep-strand-mesh, update examples
add Bezier3 impl (partial) and add protocol tests
add random PTF spline example
update macromath & cljx deps, update lein project files for all modules
bugfix pprint import in vectorseq ns
update install-all.sh due to new cljx workflow
removing ^:const metadata in geom-voxel module
replace walk/postwalk in svg.adapter ns to work w/ defrecords in CLJS
add geom.core.subdiv ns with L-system based subdivision fns for iterative refinement of curves
add SVG visualization & comparison study for chaikin & bezier subdiv schemes