Escape quoted values in headers for cURL

Closes #101
Update aruba gem

Updates the gem to get latest step files
Allow curl headers to be filtered out

This allows extraneous headers to be filtered out of the sample cURL
request. Headers such as "Host" and "Cookie" are not needed with a cURL
request and can be filtered.

Closes #42
Update sinatra in Gemfile.lock

Keep up to date with required gems. Sinatra seems to have added in a new
header in responses.
Update cucumber in Gemfile.lock

Keep up to date with required gems.
Update activesupport in Gemfile.lock

Keep up to date with required gems.
Update fakefs in Gemfile.lock

Keep up to date with required gems.
Update mustache in Gemfile.lock

Keep up to date with required gems.
Update rake in Gemfile.lock

Keep up to date with required gems.
Update webmock in Gemfile.lock

Keep up to date with required gems.
Update nokogiri in Gemfile.lock

Keep up to date with required gems.
Update rack-oauth2 in Gemfile.lock

Keep up to date with required gems.
Update capybara in Gemfile.lock

Keep up to date with required gems.
Include new curl filter option in README
Remove 1.9.2 support in travis

ActiveSupport 4.0.1 drops 1.9.2 support.
Remove uploaded data from multipart request body

See #39
Remove nested uploaded data from request body
Added a couple of features to cover nested file upload parms
Merge pull request #105 from thefrontiergroup/uploaded_data

Remove nested uploaded data from request body
Decode HTTP basic auth header and generate cURL command with user and password