Add `initText` option for bootstrapping the input text

Test Plan:
1. python -m SimpleHTTPServer 8000
2. Visit http://localhost:8000 and confirm that "Mountain View, CA"
appears in location dropdown

Reviewers: alpert

Differential Revision: http://phabricator.khanacademy.org/D3599
Add `initText` option for bootstrapping the input text

Test Plan:
1. python -m SimpleHTTPServer 8000
2. Visit http://localhost:8000 and confirm that "Mountain View, CA"
appears in location dropdown

Reviewers: alpert

Differential Revision: http://phabricator.khanacademy.org/D3599
Inline the "powered-by-google" attribution image in the stylesheet

Test Plan:
1. $ python -m SimpleHTTPServer 8000
2. Visit http://localhost:8000 and click on location dropdown
3. Right click and select "Inspect Element" on the "powered by Google"
image in the bottom right corner
4. Confirm that background-image property uses a data-uri

Auditors: csilvers