fix browserify build

fix for v2.1.1 which forgot to remove the browserify section of the package.json after the dependencies were removed, unclear how this passed our tests which use browserify. ht @ahutchings

remove unneded browserify transforms

It turns out there was a way to do the environmental variable from v2.1.0 without including 2 megs of browserify transforms, ht @sindresorhus

Add enviromental variable to allow smoke testing

running in node with the environmental variable READABLE_STRAM set to 'disable' will cause this module to simply return the platform streams. The goal of this is to allow us to test changes to node streams and see if they will break modules using readable-stream. Transforms have been added so that in browserify (where the streams module is build on readable-streams) this change will be removed and not bloat the build.

backport of v2.1.0 to the ~1.1.0 line

back port of v2.1.0 to the ~1.1.0 line, doesn't include the transform changes because browserify streams are unconditionally imported in that version.

Back port of v2.1.0 to the ~1.0.0 line

back port of v2.1.0 to the ~1.0.0 line, doesn't include the transform changes because browserify streams are unconditionally imported in that version.

v2.0.6 based on node v5.8.0

User facing change are

• nodejs/node#4354 which is a perf improvement when sending a lot of small chunks
• #188 which fixes sync writes causing a stack overflow in node 0.10 (with zero overhead for non node 0.10)

Behind the scenes we are now using babel to deal with the es6 features such as let, const, and arrow functions so those should be a lot cleaner now

2.0.2

• ca99c19 fixes for browserify compatibility thanks to @zertosh

2.0.1

• various updates to the readme
• correctly export .Stream (fd31267)
• and fallback to if it's not available (1803914)
• add browser tests (b681059)
• fix bug with encoding (b681059)
• build based off node 2.3.0 (edae701)
• build node.js docs (ca8ca2e)
• tweak build to be faster (e3bf6c5) @shinnn