Enabled django.middleware.csrf.CsrfViewMiddleware

Enabled global csrf checking to have proper validation
Added csrf_token tag to template and forms

Added tokens to the end of form tags to make it easier to grep
them and it matches previous formatting.
Removed decorator

Decorator no longer needed as all necessary forms are protected
with CsrfViewMiddleware in middleware classes.
Remove the seond variable definition "display_name"
Updated Mac date, proposed clearer wording

When using these instructions to install on Mac, I found a specific sentence confusing. I have added the following changes:

1. After verifying the installation instructions on Mac, I have changed the 'last verified date' for Mac (in MMM DD, YYYY to avoid ambiguity).

2. I found a sentence under 'Set up the database' to be very confusing, and am proposing the following wording:

old: This will print out *lots* of text, when you are done you should see something like the output listed in Output Samples below, at the end of which, your tables should be ready. You're ready to run the site.

new: This will print out *lots* of text. Once all of the text is printed, you should see something like the output listed in `Output Samples`_ below. Afterwards, your tables should be ready. You're ready to run the site.

3. I think having a link to the section 'Output Samples' would be useful, as this was not immediately clear to me.
Merge pull request #264 from annnnny/master

Remove the seond variable definition "display_name"
Merge pull request #267 from younjin/patch-3

Updated Mac date, proposed clearer wording.
Merge pull request #247 from bugzPDX/bug_917

Add CSRF tokens to more templates; enable middleware

Closes: https://openhatch.org/bugs/issue917
Fixed #990 Deleted references to geolocation, maps, guessing location

Deleted code in the settings page that has any mention of geolocation and maps,
including geo-location-related html, views, and tests.

Changed default url link "settings" on header from
/settings/location/ to /settings/invite_someone.

Made design decision to re-structure left-hand navigation bar on
settings page in order to improve UI:
    "Tell friend about OpenHatch" tab appears first on top left,
    followed by the "Widgetize yourself" tab, and finally,
    the "Email", "Name", and "Password" navigation tabs.

Made design decision to have the message "If you want us to forget your
location, empty out the text field and hit save" appear as the default
location message in settings page.