Update README example with smtp and mailcatcher

Hi, i would suggest to add this patch, it's very helps me during testing. Sorry for bad English.
Fixing #523 with a rdoc --exclude param
Added cc matcher
Merge pull request #583 from rwestgeest/master

I have added a cc matcher in has_sent_mail
Add more charsets from our internal list
Merge pull request #576 from srawlins/add-rdoc-exclude-to-gemspec

Fixing #523 with a rdoc --exclude param
Stop quote_phrase from modifying input string encoding

In the case where it acted to quote the input string, quote_phrase
shouldn't modify the encoding of the input string to be ASCII-8BIT, but
should leave the encoding as it found it.
Encoding test is invalid in Ruby 1.8.
Add simple header example to readme
Merge pull request #588 from ahawkins/patch-1

Add simple header example to readme
Body#split! fixed to not raise error in case missing boundary, spec added
Merge pull request #597 from railsware/missing_boundary

Body#split! fixed to not raise error in case missing boundary
Revert invalid spec change from 034f132f7c49382bd61bd9bad3ce3c48f498b60d
Fix Message comparison method to ensure there's no side-effects.

Comparing a Message w/o message_id set to another object would set it's
Message-ID to a temporary value.  Ditto for the object compared to.
Merge pull request #603 from commandprompt/fix-message-comparison-take2

Fix message comparison: take 2
Clean up Message#== to remove superfluous assignments and return value handling. Move temp message_id assignment into the ensure block.
Added RubyMine/IntelliJ IDEA configuration directories and rbenv config files to .gitignore
Added bcc RSpec matcher
don't change encoding of string input to Mail.new
Added missing Ruby syntax highlights to the README