Clarify how to enable the debug mode in the readme

I would like to clarify how to enable the debug mode.
At first was adding a :inspector => true meta tag to my examples.
I've found the answer in this issue
https://github.com/jonleighton/poltergeist/issues/47

At least one person more made the same mistake, so maybe its useful.
Fix typo
Merge pull request #284 from cibernox/master

Clarify how to enable the debug mode in the readme
Remove PhantomJS, installed by default on Travis

I talked to @joshk today since our Poltergeist tests were passing on Travis without this stuff in our travis.yml and he said PhantomJS is now installed by default on Travis, so you shouldn't need this.
Merge pull request #287 from olivierlacan/patch-1

Remove PhantomJS, installed by default on Travis
Bump to Capybara 2.1 in gemspec
Fix a few remaining failures from the Capybara 2.1 suite
ruby 1.9.2 is not supported
bump to 1.2.0
fix capybara version dependency
bump version to 1.1.1
Merge branch '1.1.1'

Conflicts:
	README.md
	lib/capybara/poltergeist/version.rb
	poltergeist.gemspec
fix logging of mouse event co-ordinates
Ensure default state at start of a command

This should help to reduce obscure bugs. For example if a click fails,
currently the state will be stuck as "mouse_event", and won't go back to
"default". In theory that's a programming error, but this change should
deal with that whole category of errors.
Throw a useful error on invalid selector

Closes #296
Driver can enable or disable PhantomJS cookies

As of 1.7, PhantomJS allows its `CookieJar` to be enabled or disabled using the
`cookiesEnabled` function. This commit adds access to that from the driver
using a similarly named `cookies_enabled=` method.

For more information on the API, check out:

https://github.com/ariya/phantomjs/wiki/API-Reference-phantom#cookiesenabled-boolean
fix typo
Merge pull request #300 from mfrost/cookies_enabled

Driver can enable or disable PhantomJS cookies
Improve PhantomJS version checking

Naive implementation of raw string comparison fails on version
starting from '1.10.0'. The new implementation converts version parts
to integers and checks them in turn starting from major part.
Merge pull request #318 from hron/improve-phantomjs-version-checking

Improve PhantomJS version checking