Create directory from argument in compile task

Previously, the compile task would always create a tmp/ directory, even
if another directory is specified. The specified directory was also not
created if necessary.
Merge pull request #565 from carlosdp/create-css-path-dir

Create directory from argument in compile task
rake convert
readme: specify mincer import ext [ci skip]
converter: dropdown-toggle
rake convert
comment on bootstrap-mincer
readme: precision on libsass update [ci skip]
Clean up dependencies

* Do not depend on sass-rails gem for testing
* Remove unused dummy rails app dep-s
mv test/dummy test/dummy_rails
Fix for issue #492 "Could not locate Gemfile"
Readme svg badge [ci skip]
rake convert
Fix incorrect path to bootstrap.scss

The command to copy the bootstrap.scss file (the one with all components listed) specifies the incorrect path.
NPM welcome.

Closes #572.
Readme: Update bower package name
rake convert
Merge pull request #568 from bittner/master

Doc #492 "Could not locate Gemfile"
Merge pull request #575 from djanowski/package-json

NPM welcome.
Merge pull request #576 from danbower/update-bower-package-name

Readme: Update bower package name