Adds flSHA user field for incoming users.

#### What's this PR do?
- Sets `flSHA` user field for incoming users

#### Any background context you want to provide?
This will work in case the `flSHA` exists in the `tigapi.Users` table:
![screen shot 2014-11-18 at 12 35 56 am](https://cloud.githubusercontent.com/assets/672669/5079195/e13feb34-6eba-11e4-85b3-0c6879b668ce.png)

Consistency with current Drupal implementation verified by integration tests:
![image](https://cloud.githubusercontent.com/assets/672669/5079213/ffe0d530-6eba-11e4-9706-a156d6ef15f6.png)

#### What are the relevant tickets?
Closes #8.