Introduce konacha-chai-matchers for chai-plugins

A single gem to get access to all chai matcher plugins
Update mocha (1.7.3) and chai (1.4.0). Closes #84
Add parent view spec
Add license to gemspec
Merge pull request #87 from petedmarsh/master

Add license to gemspec
Merge pull request #83 from matthijsgroen/update-readme

Introduce konacha-chai-matchers for chai-plugins
Adds the ability to run the Mocha test server while developing on Konacha with the Rake task 'server'.
Merge pull request #89 from billmag/server

Adds the ability to run the Mocha test server while developing on Konach...
Fix path to iframe being wrong when mounted as an engine

Mounting the engine at "/konacha" would still reference the iframes at
"/iframe/…" instead of "/konacha/iframe/…".
Add issue URLs
Switch up allowed failures

1.8.7 seems pretty stable lately. Rails 4 unstable, e.g.:

https://travis-ci.org/jfirebaugh/konacha/jobs/3560965
https://travis-ci.org/jfirebaugh/konacha/jobs/3516936
Revert capybara 2.0 dependency

Konacha will work just fine with either 1.0 or 2.0.
Update mocha (1.7.4)
Test runner with both selenium and poltergeist
Development dependency goes in gemspec
Update mocha (1.8.1) and chai (1.4.2)
Release 2.2.0
Allow url parameter to set Konacha run mode
Allow reusing sessions and inject new urls

This is needed for tighter integration in Guard-Konacha. This allows a
single Capybara session to handle all guard runs and drastically
increase performance
Add tests for @run_mode