make all configuration configurable

As a user
I want to be able to change all sprocket settings
In order to adjust them to my projects needs
add tests
use eq syntax for rspec
make sense of test
fixed tests also switched rspec deprecated syntax to new expect syntax
Update asset_pipeline_spec.rb
use correct compairsion where it makes sense
Add path_prefix
Fixed deprecation error
Added tests, all passing
Fixed failing test
Merge pull request #38 from jamiees2/master

Add path prefix to sprocket helper
Merge branch 'patch-1' of github.com:nesQuick/sinatra-asset-pipeline into nesQuick-patch-1

Conflicts:
	lib/sinatra/asset_pipeline.rb
	spec/asset_pipeline_spec.rb
Merge branch 'test_2_0' of github.com:nesQuick/sinatra-asset-pipeline into nesQuick-test-2_0

Conflicts:
	spec/asset_pipeline/task_spec.rb
Make all tests use expects
Bump version
Expect on path_prefix default
adding option to set sprockets helpers to expand the assets, it defaults to false
renaming to assets_debug to be more in line with sprockets::helpers naming
Merge pull request #39 from kwbock/kb/assets-debug

Option to Expand Assets