Update README.md

edited parameters on schedules.create() to show available options ={} in use. Suggestion to change the other code samples in this Readme.md to reflect this as it helps save a trip to the docs.
Build cache support.
Passing used stack to builder
Passing used stack to builder (try 2)
Update gems.json

 adding some common gems with binary dependencies  
    "mini_magick",
    "rmagick",
    "mysql2",
    "sqlite3",
    "json",
    "pg"
Update gems.json

removed json added atomic to gem cache
Update gems.json

common gems with binary dependencies and versions
Merge pull request #176 from Stephenitis/master

Update gems.json
Fixed cache builder.
Stack support for cache builder.
Extra protection for gb
updated gb.rb

added silent
draft tests for stacks
Welcome to wonderful rubygems world.
adding yajl 1.1.0
adding atomic 1.1.14
Update gems.json

http parser gem
Update README.md

"run use" -> "use"
Merge pull request #177 from rdallman/patch-1

Update README.md
Adding bcrypt.