Related: team#98

Related: team#44

Try again if TCP connection cannot be established

See merge request !3

Try TCP connection again if the first error was a timeout.

Three seconds isn't much time at all -- especially for an unreliable or
congested Internet link.

This patch fixes #3

Here's the algorithm I used to pick a replacement:

1. Open <https://metrics.torproject.org/rs.html#search/flag:guard>.
2. Sort by uptime in descending order.
3. Pick a relay that has been around for a while and uses an OR port
   that's different from our other test targets.

The colocation site where the bridge is running will be shut down.

The previous URL now results in a 404.

Changed the Google URL to always visit English version of page. Ref #2

Closes #2

See merge request !2

Enable cross-compilation for OS X.

Closes #1

See merge request !1

This is as simple as using GOOS=darwin.  This patch also adds a new
default target, which compiles emma for the native platform.  Many users
may not want pre-compiled binaries but instead compile emma themselves.

This fixes issue #1.

BridgeDB's email autoresponder only allows email from Gmail and Riseup.
We are already testing accounts.google.com (which one must use to log
into Gmail) and this patch adds a test for Riseup.

Before opening Gmail, one needs to log in over accounts.google.com.  If
this page is available, Gmail probably is too.

We are already testing websites and as part of that, we are resolving
domains.