Convert `=&gt;` to the more semantic `&rarr;`.

`&rarr;` is defined in the HTML 4 spec [1]:

  <!ENTITY rarr CDATA "&#8594;" -- rightwards arrow, U+2192 ISOnum -->

Don't make these replacements in example Python code:

On Sun, Jan 06, 2013 at 05:47:00AM -0800, Greg Wilson wrote:
> On 2013-01-06 8:37 AM, W. Trevor King wrote:
> > On Sun, Jan 06, 2013 at 05:21:02AM -0800, Greg Wilson wrote:
> > > * Where '=>' appears as a string in a Python program to be printed,
> > > it should be left alone.
> >
> > Oops. Sloppy me not checking all my automatic replacements. How do
> > you feel about replacing the Python occurences with `\u2192'`?
>
> -1: I don't want us to have to explain Unicode escape sequences that
> early in the show.  If we could actually trust all the editors people
> use, and legacy tools like Cygwin's 'cat', to display non-7-bit
> characters correctly, I'd just put the ' →' directly in the source, but
> hey, I'd like a unicorn too...

[1]: http://www.w3.org/TR/html4/sgml/entities.html
Updating Bootstrap files to version 2.2.2, which will hopefully address #256.
Blog post about Mozilla boot camp
Added Greg's instructions for contributing a blog post to CONTRIBUTING.md
Merge pull request #256 from jiffyclub/update-bootstrap-2.2.2

Drop down menu on SWC website not behaving as expected on mobile browsers
Merge pull request #260 from pipitone/contributing-blogging

Added Greg's instructions for contributing a blog post to CONTRIBUTING.md
Merge branch 'master' of github.com:swcarpentry/website
Fixing boot camp description
Converting first row to 'th' elements
Fixing markdown formatting issues in CONTRIBUTING.md
Explicitly naming @gvwilson and @pipitone in CONTRIBUTING.md
Changed content description for GEOMAR page

Removed reference to _content.html, added HTML for their planned
syllabus. Also added ,Germany to location because I didn't know where
Kiel was. (Kept wanting it to be typo of Kiev.)
Merge pull request #258 from gvwilson/master

Blog post about boot camp at Mozilla
Adding a link to an old blog post
Added blog post for UBC

Also modified the metadata to include my name.
Fixed broken list

I moved the sublist into the same <li> element as the headers in the
list of topics, for more correctness.
Merge branch 'master' of github.com:swcarpentry/website
Merge pull request #261 from amyrbrown/master

Changes to GEOMAR boot camp page.
Merge branch 'master' of github.com:swcarpentry/website
Tidying up Ted Hart's blog post