Add modal API
Update examples fill_in 'Email' and click_button
Merge branch 'notification_api' of https://github.com/mikepack/capybara into modal

* 'notification_api' of https://github.com/mikepack/capybara:
  Add modal API
Warn when attempting to set a value to a readonly field
Merge pull request #1329 from jnicklas/warn_on_set_readonly

Warn when attempting to set a value to a readonly field
RSpec3 no longer beta
support for and/or compounding of rspec matchers with tests
Support RSpec expose_dsl_globally configuration option
Merge pull request #1328 from jnicklas/compound_matchers

support for and/or compounding of rspec matchers with tests
Merge pull request #1330 from jnicklas/rspec_scoping

Support RSpec expose_dsl_globally configuration option - fix issue #1285
Use RSpec::Core::Version instead of RSpec::Version
because capybara/rspec requires rspec-core, but not rspec.
Merge pull request #1332 from hanachin/use-rspec-core-version

Use RSpec::Core::Version instead of RSpec::Version
Implementation for issue #1319 - propagate fill_in options to Element#set
basic test for fill_in options propagation
Fix visiting urls with non-http(s) schemes
parallelize jobs and use system libraries with nokogiri
Merge pull request #1339 from abotalov/fix_schemes_handling_in_visit

Fix visiting urls with non-http(s) schemes
Merge pull request #1342 from jnicklas/travis_speedup

parallelize bundler and use system libraries with nokogiri
fix warning about metadata filtering under RSpec 3
Merge pull request #1338 from jnicklas/fill_in_options

first run at issue #1319 - propagate fill_in options to Element#set