Show informative icon while establishig HTTP connection

[specious]

Due to a recent user interface change in Google Chrome, this browser extension now manifests as a persistent button in the tool bar. See: #25

Previously, when a page was loading and the HTTP connection wasn't yet established, this extension's icon was hidden. However, now it displays the greyed out default icon, which looks somewhat purposeless and mystifying:

Once the HTTP connection is established, it shows the relevant icon:

What would be a good icon to display while the HTTP connection is being established?

[kav2k]

The good icon would be of the same shape as the actual final icon.

Since it would necessarily be grayscale, it can be confused with the "NOT SPDY-enabled" one.

Suggesting a hollow lightning bolt - I'll try to make a pull request with this.

[kav2k]

Is fixed by either #28 or better #29

[kav2k]

Should be closed now with #29 merged in.