Depend on the 4.* Rails instead of 4.0.*

While at it, drop the strict 2.0.* dependency on sprockets-rails too...
and fix a case of mismatched indentation that bothered me.
Release 1.0.2

Use less strict Rails version dependencies. We want it to work on Rails
4.1 too.
Fallback to rails console on no local bin/rails

A lot of the people will be upgrading to Rails 4, so their applications
will most likely lack relaitive `bin/rails`. In this case try to default
to `rails console`.
Release 1.0.3

Closes #6. This seems to be a common situation with projects upgrading
to Rails 4.
We're up to 1.0.3 now
Reword the README a bit

I think it looks a bit more understandable that way.
Merge upstream 1.0.3 changes

Conflicts:
	Gemfile.lock
	README.markdown
	lib/web_console/engine.rb
	web-console.gemspec